Final Prep
Serotonin is a molecule involved in the transmission of nerve impulses. One of the organic families present in serotonin is ___. a. ester b. alkyne c. phenol d. aldehyde
***
What is the mass in grams of 3 moles of calcium carbonate, CaCO3, a common antacid? a. 300 grams b. 150 grams c. 100 grams d. 68 grams
***
Which of the following contains a nonpolar covalent bond? Select one: a. LiBr b. CaCl2 c. H2O d. O2
. O2
The correct conversion of 1 L is ___. Select one: a. 1 m^3 b. 1000 m^3 c. 0.001 m^3 d. 100 m^3
0.001 m^3
A Nutrition Facts label on a food package indicates that one serving contains 2% of the recommended daily allowance (RDA) of iodine. If the serving size is one cup and the RDA for iodine is 0.15 mg per day, calculate the amount (in milligrams) supplied by one serving. Select one: a. 0.0030 mg b. 15 mg c. 20 mg d. 0.15 mg
0.0030 mg
Which of the following numbers contains the designated CORRECT number of significant figures? Select one: a. 30.1 C 2 significant figures b. 3.6 x 102m 3 significant figures c. 0.00450 m 3 significant figures d. 27.051 mL 4 significant figures
0.00450 m 3 significant figures
The number of moles of calcium (Ca) represented by 7.39 g of calcium is Select one: a. 40.0 moles of Ca. b. 18.6 moles of Ca. c. 0.184 mole of Ca. d. 296 moles of Ca.
0.184 mole of Ca.
At 20C, the density of ethyl alcohol is 0.789 g/mL, and that of water is 1.00 g/mL. Calculate the specific gravity of ethyl alcohol at 20 C. Select one: a. 0.651 b. 0.789 c. 1.45 d. 6.51
0.789
How many atoms of sodium are there in 0.200 moles sodium atoms? Select one: a. 6.02 x 10^24 atoms b. 6.02 x 10^23 atoms c. 1.20 x 10^23 atoms d. 1.20 x 10^24 atoms
1.20 x 10^23
How much will the temperature change when 3.0 g of tooth enamel (specific heat = 0.18 cal/g C) absorbs 0.80 cal of heat energy? Select one: a. 2.4C b. 3.7C c. 1.5C d. 8.6C
1.5C
The temperature of a patient is found to be 38.5 C. What is this temperature in F? Select one: a. 96F b. 101F c. 69F d. 107F
101F
Calculate the mass of 10.00 moles of nickel(II) cyanide, Ni(CN)2. Select one: a. 847.0 grams b. 987.0 grams c. 1107 grams d. 1694 grams
1107 grams
Sulfur has ___ electrons and ___ valence electrons. Select one: a. 16, 6 b. 32, 4 c. 16, 0 d. 32, 6
16, 6
Each of the numbers below is measured. Solve the calculation and give the correct number of significant figures. 3.52 x 10^-16 - 8.16 x 10^-17 Select one: a. 2.704 x 10^-15 b. 4.64 x 10^16 c. 2.7 x 10^-16 d. 27.04 x 10^14
2.7 x 10^-16
The normal dosage for azinthromycin, an antibiotic, is 3.3 mg/kg. What is the proper dose for a 150 lb patient? (Given: 1kg = 2.205 lbs.) Select one: a. 100 mg b. 224 mg c. 300 mg d. 495 mg
224 mg
Predict the number of covalent bonds by N atom. Select one: a. 1 b. 2 c. 3 d. 4
3
The instructions for a cough syrup are to give 2 teaspoons every 8 hours. The cough syrup is supplied in 150-mL bottles. How many bottles must be purchased to treat 3 children for 5 days? (Given 1 tsp = 5 mL.) Select one: a. 1 bottle b. 2 bottles c. 3 bottles d. 4 bottles
3 bottles
An atom of cobalt with a mass number of 60 has how many neutrons? Select one: a. 27 b. 33 c. 59 d. 60
33
Zenapax® is used as part of immunosuppressive therapy for transplant patients. The dosage is calculated on the basis of 1.0 mg/kg. What is the proper dose for a 175 lb patient? (Given: 1kg = 2.205 lbs.) Select one: a. 79 mg b. 175 mg c. 385 mg d. 875 mg
79 mg
A patient weighs 205.0 pounds, but the weight is to be recorded in kilograms. What is the patient's weight in kilograms using whole numbers? (Given: 1 kg = 2.205 lbs.) Select one: a. 451.4 kg b. 205.0 kg c. 100.4 kg d. 92.97 kg
92.97 kg
What is the minimum protection against exposure to beta particles? Select one: a. None, beta particles are of low energy and cannot penetrate skin. b. Gloves, a lab coat, or over a meter's distance from the source. c. A thin sheet of plastic or metal. d. A sheet of lead 18)The quality factor (QF) for alpha particles is 20. What is the radiation dose in remsfor this patient if he absorbed 13 rads of alpha particles? a) 20 rems b) 13 rems c) 23 rems *d) 260 rems
A thin sheet of plastic or metal.
Which statement is incorrect? Select one: a. According to the atomic theory, all matter is composed of atoms. b. Protons, neutrons, and electrons are subatomic particles. c. Electrons have greater mass than protons. d. Neutrons are found in the nucleus of the atom.
Electrons have greater mass than protons.
Helium forms an ion with a 2+ charge. True False
F
SO3 2- is called the sulfur trioxide ion. True False
F
1 mg is larger than 1 dg. Select one: True False
False
All molecules with polar covalent bonds are polar. True False
False
An oxidation reaction can be defined as when an atom loses an oxygen. Select one: True False
False
An oxidizing agent is the reactant in an oxidation - reduction reaction that causes reduction of another reactant by providing electrons for the other reactant to accept. Select one: True False Feedback The correct answer is 'False'.
False
Benedict's solution turns a blue color in the presence of glucose. Select one: True False Feedback The correct answer is 'False'.
False
Calcium is a transition metal as is indicated by its location in the periodic table. Select one: True False
False
Cellulose is composed of glucose molecules connected by a-glycosidic linkages. Select one: True False Feedback The correct answer is 'False'.
False
Dioxygen difluoride whose actual three dimensional shape is provided below is non-polar. Select one: True False
False
Dioxygen difluoride whose actual three dimensional shape is provided below is non-polar. True False
False
Fibrous proteins, because of their long fibers, tend to be soluble in water. Select one: True False Feedback The correct answer is 'False'.
False
Hydrocarbons can take part in dipole-dipole interactions. Select one: True False
False
Hydrocarbons can take part in dipole-dipole interactions. True False
False
Red blood cells will shrink in a hypotonic solution. Select one: True False Feedback The correct answer is 'False'.
False
Rusting of iron is a physical change. Select one: True False
False
SO32- is called the sulfur trioxide ion. Select one: True False
False
Sphingolipids are amphipathic hydrolysable lipids based on glycerol. Select one: True False Feedback The correct answer is 'False'.
False
The Si-Si bond in Cl3SiSiCl3 is expected to be polar. Select one: True False
False
The method to determine the number of stereoisomers of a monosaccharide is to calculate 2n, where n is the total number of carbons in the molecule. Select one: True False Feedback The correct answer is 'False'.
False
The subscripts of a chemical formula can be changed to balance a chemical equation. Select one: True False
False
When alcohols are dehydrated in the presence of H+ and heat, the major product is that formed by removal of -OH from one carbon atom and removal of -H from the neighboring C atom that carries more H atoms. Select one: True False Feedback The correct answer is 'False'.
False
When ∆G for a reaction is +286 kcal, the reaction is spontaneous. Select one: True False
False
Which statement is correct? Select one: a. Cr is in period 6B. b. Fe is a transition metal. c. Mg is an alkali metal. d. Cl is an inert gas.
Fe is a transition metal.
Which of the following is an anion? Select one: a. F b. Al3+ c. Mg d. I-
I-
A patient's temperature is taken three times by two nurses. The results of three successive temperatures by each nurse are Nurse A Nurse B 98 F 90 F 99 F 100 F 97 F 96 F The patient's actual temperature is 101 F. Which of the following statements is true? Select one: a. Nurse A's results are more precise than those of nurse B. b. Nurse B's results are more accurate than those of Nurse A. c. Both nurses have precise results. d. Nurse B's results are both accurate and precise.
Nurse A's results are more precise than those of nurse B
Sodium carbonate is an ionic compound whose formula is NaCO3. True False
T
What is the molar concentration of hydronium ions in a sample of a soft drink that has a pH of 4? Select one: a. 1/4 M b. 4 M c. 1 x 104 M d. 1 x 10-4 M Feedback The correct answer is: 1 x 10-4 M
The correct answer is: 1 x 10-4 M
Choose the type of shape from Column 2 that best matches each item in Column 1. CO2 Answer 1 NH3 Answer 2 CH2O Answer 3 CH4 Answer 4 SO2 Answer 5 Answer Options: bent linear pyramidal tetrahedral trigonal planar
The correct answer is: CO2 → linear, NH3 → pyramidal, CH2O → trigonal planar, CH4 → tetrahedral, SO2 → bent
Which of the following statements is true about alkanes? Select one: a. alkanes contain polar bonds b. alkanes are attracted to one another by London forces c. alkanes are polar molecules d. alkanes are unsaturated hydrocarbons Feedback The correct answer is: alkanes are attracted to one another by London forces
The correct answer is: alkanes are attracted to one another by London forces
Which of the following is not a common characteristic of an acid? Select one: a. it turns litmus pink/red b. it tastes bitter c. it dissolves common metals d. all of these choices are common characteristics of acids Feedback The correct answer is: it tastes bitter
The correct answer is: it tastes bitter
A mercury thermometer is used to take four temperatures of a solution. The temperatures are 44.8 ºC, 44.9 ºC, 45.0 ºC, and 45.1 ºC. An alcohol thermometer was also used and measured 44.9 ºC, 45.3 ºC, 45.4 ºC, and 45.9 ºC. The solution is correctly determined to be 45.0 ºC by other means. Which conclusion is correct? Select one: a. The mercury thermometer is the more precise. b. The alcohol thermometer is the more precise. c. There is no difference between the thermometers. d. There is no way to determine precision with these temperatures.
The mercury thermometer is the more precise.
A Roman numeral is used in the name of transition metal ions. That numeral indicates the charge of the ion. True False
True
A pair of compounds are stereoisomers and they are nonsuperimposable mirror images. This pair of isomers is referred to as a pair of enantiomers. Select one: True False Feedback The correct answer is 'True'.
True
An atom contains 12 protons and 12 neutrons, and a different atom contains 10 protons and 12 neutrons. These two atoms are not isotopes. Select one: True False
True
Blood type is determined by oligosaccharides attached to the surface of red blood cells. Select one: True False Feedback The correct answer is 'True'.
True
Both starch and cellulose are polysaccharides of glucose. Select one: True False Feedback The correct answer is 'True'.
True
Catalysts lower the activation energy of a chemical reaction. Select one: True False
True
Platinum serves to catalyze some hydrogenation reactions. Select one: True False Feedback The correct answer is 'True'.
True
Protein molecules with the appropriate structure to be biologically active are native molecules. Select one: True False Feedback The correct answer is 'True'.
True
Sphingolipids are a class of phospholipids. Select one: True False Feedback The correct answer is 'True'.
True
The greater the difference in electronegativity of the atoms involved, the more polar the covalent bond. Select one: True False
True
The kinds of interactions that exist between CH3COOH molecules include dipole-dipole (including hydrogen bonding) interactions and London forces. Select one: True False
True
The net charge of peptides and proteins affects their solubility. Select one: True False Feedback The correct answer is 'True'.
True
The reaction in which a primary alcohol becomes an aldehyde is an oxidation reaction. Select one: True False Feedback The correct answer is 'True'.
True
The zeros in 0.00958 cm are not significant. Select one: True False
True
The Si-Si bond in Cl3SiSiCl3 is expected to be polar. True False
True False
The name of the compound Na2CO3 is a. sodium carbonate. b. disodium carbonate. c. sodium bicarbonate. d. disodium bicarbonate.
a
Which of the following is an example of a physical change? Select one: a. a piece of paper cut into small pieces b. burning of paper c. butter becoming rancid d. baking a cookie
a piece of paper cut into small pieces
The oxidation of methanethiol by I2 produces what product? Select one: a. b. c. d.
a.
Blood serum has a calcium ion (Ca2+) concentration of 3.9 x 10-4 M. What is the concentration in mEq/L? Select one: a. 0.78 mEq/L b. 0.39 mEq/L c. 2.3 mEq/L d. 6.8 mEq/L Feedback The correct answer is: 0.78 mEq/L
a. 0.78 mEq/L
Shown here is the amino acid glycine at a pH of ___. Select one: a. 1 b. 7 c. 14 d. both 1 and 14 Feedback The correct answer is: 1
a. 1
How many electrons are contained in sulfide ion? a. 18 b. 14 c. 30 d. 16
a. 18
In the following reaction, how many grams of water are needed to completely hydrolyze 30.8 g of the ester? Select one: a. 7.48 g b. 0.416 g c. 30.8 g d. 11.3 g
a. 7.48 g
How many grams of AgNO3 are required to make 500.0 mL of a 0.10 M solution? Select one: a. 8.5 g b. 17 g c. 85 g d. 0.10 g Feedback The correct answer is: 8.5 g
a. 8.5 g
An important reaction in chemistry is oxidation. Which is an oxidation reaction? Select one: a. An alcohol is converted into a ketone. b. An oxygen is removed from an alcohol. c. A double bond between an oxygen and a carbon is broken. d. A carbonyl group is modified to produce an alcohol. Feedback The correct answer is: An alcohol is converted into a ketone.
a. An alcohol is converted into a ketone.
Identify the compound that is insoluble in water. Select one: a. Ba3(PO4)2 b. Ba(NO3)2 c. K3PO4 d. AgNO3 Feedback The correct answer is: Ba3(PO4)2
a. Ba3(PO4)2
Which of the following is released from the gallbladder into the small intestine to aid digestion by dispersing dietary lipids into fine emulsions? Select one: a. Bile salts b. cholesterol c. eicosanoids d. phospholipids Feedback The correct answer is: Bile salts
a. Bile salts
Choose the comment that is appropriate for the reaction: Select one: a. Carbonic anhydrase catalyzes the conversion of carbon dioxide into carbonic acid. b. The reaction runs in forward direction only. c. This reaction runs in backward direction only. d. This is a reaction that only occurs in the laboratory. Feedback The correct answer is: Carbonic anhydrase catalyzes the conversion of carbon dioxide into carbonic acid.
a. Carbonic anhydrase catalyzes the conversion of carbon dioxide into carbonic acid.
Which of the following molecules is polar? Select one: a. H2CO (hint: C is the central atom) b. CH4 c. N2 d. BCl3¬ (hint: B is the central atom and doesn't have an octet)
a. H2CO (hint: C is the central atom)
Which of the following molecules is polar? a. H2CO (hint: C is the central atom) b. CH4 c. N2 d. BCl3¬ (hint: B is the central atom and doesn't have an octet)
a. H2CO (hint: C is the central atom)
Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce an alcohol? Select one: a. OH- b. SH- c. I- d. -OCH3 Feedback The correct answer is: OH-
a. OH-
The skeletal structure of docosahexaenoic acid, an essential fatty acid, is provided below. Docosahexaenoic acid is best classified as: Select one: a. Omega-3-fatty acid b. Omega-6-fatty acid c. Saturated fatty acid d. Wax Feedback The correct answer is: Omega-3-fatty acid
a. Omega-3-fatty acid
The formula of a phosphate ion is ___. a. PO4 3- b. P3- c. HPO4 2- d. H2PO4 -
a. PO4 3-
Which of the following sentences is true? Select one: a. Rearranging the amino acid residues in a peptide or protein changes its function. b. In an α-helix form, portions of polypeptide chain line up side by side with hydrogen bonds holding neighboring strands of sheet together. c. The order of amino acid residues in a protein is referred to as its tertiary structure. d. The overall three-dimensional shape of a protein is referred to as its primary structure. Feedback The correct answer is: Rearranging the amino acid residues in a peptide or protein changes its function.
a. Rearranging the amino acid residues in a peptide or protein changes its function.
What would be the product if we attempt to oxidize a 3º alcohol? Select one: a. There would be no product, 3º alcohols cannot be oxidized. b. The product is a ketone. c. The product is a carboxylic acid. d. The product is a thiol. Feedback The correct answer is: There would be no product, 3º alcohols cannot be oxidized.
a. There would be no product, 3º alcohols cannot be oxidized.
What is the function of nonsteroidal anti-inflammatory drugs (NSAID)? Select one: a. To interrupt the production of prostaglandins from arachidonic acid. b. To interfere with the production of anabolic steroids. c. To facilitate the production of cyclooxygenase. d. To stimulate the production of leukotrienes. Feedback The correct answer is: To interrupt the production of prostaglandins from arachidonic acid.
a. To interrupt the production of prostaglandins from arachidonic acid.
Oleic acid has the formula CH3(CH2)7(CH = CH(CH2)7CO2H. The carbon -carbon double bond in oleic acid is usually cis. Compared to saturated fatty acids with the same number of carbon atoms, cis-oleic acid will have Select one: a. a lower melting point due to a kink in the hydrocarbon tail. b. stronger London forces and a higher melting point. c. bonds that fit in the packing of the hydrophobic tails, creating stronger interaction between molecules. d. no reaction with hydrogen in the presence of platinum catalyst. Feedback The correct answer is: a lower melting point due to a kink in the hydrocarbon tail.
a. a lower melting point due to a kink in the hydrocarbon tail.
Shown below is a cyclic form of D-galactose. This structure is classified as ___. Select one: a. a-D-galactopyranose b. b -D-galactofuranose c. a-D-galactofuranose d. b -D-galactopyranose Feedback The correct answer is: a-D-galactopyranose
a. a-D-galactopyranose
Calcium chloride has the formula CaCl2. As an ionic compound it is a. composed of one cation and 2 anions. b. held together by means of covalent bonds. c. composed of two cations and one anion. d. more likely a molecular compound.
a. composed of one cation and 2 anions.
Oxygen is dissolved into water to make a solution. If the temperature of the solution is increased, the solubility of the oxygen will ___. Select one: a. decrease b. increase c. be unchanged Feedback The correct answer is: decrease
a. decrease
The proper name for P2O5 is Select one: a. diphosphorus pentoxide b. phosphorus pentoxide c. phosphate oxide d. phosphorus oxide
a. diphosphorus pentoxide
A compound is likely to be hydrophilic if Select one: a. it contains polar groups. b. all of the chemical bonds are covalent. b) the compound forms strong London force interactions between molecules. d) there are many carbon atoms in the skeleton of the molecule. Feedback The correct answer is: it contains polar groups.
a. it contains polar groups.
What is the shape around C atom in OCN-? a. linear b. bent c. pyramidal d. Trigonal planar
a. linear
When a person exhales air Select one: a. lung volume decreases and lung pressure increases b. lung volume decreases and lung pressure decreases c. lung volume increases and lung pressure decreases d. lung volume increases and lung pressure increases Feedback The correct answer is: lung volume decreases and lung pressure increases
a. lung volume decreases and lung pressure increases
The sequence of the amino acids in a protein is known as the ___ structure. Select one: a. primary b. secondary c. tertiary d. quaternary Feedback The correct answer is: primary
a. primary
An inhibitor is a substance that affects an enzyme by Select one: a. reducing the ability to act as a catalyst. b. removing the prosthetic group from an enzyme. c. reacting with the enzyme so there is less effect of the chemical reaction's surroundings on the rate of reaction. d. stopping the separation of the enzyme from the product keeping the reaction from going to completion. Feedback The correct answer is: reducing the ability to act as a catalyst.
a. reducing the ability to act as a catalyst.
The structure of the fatty acid, palmitic acid, is Palmitic acid is a(n) ___ fatty acid. Select one: a. saturated b. monounsaturated c. polyunsaturated d. waxy Feedback The correct answer is: saturated
a. saturated
The following equation is an example of a ___ reaction. Select one: a. synthesis b. decomposition c. single replacement d. double replacement Feedback The correct answer is: synthesis
a. synthesis
The compound that is expected to have the highest boiling point is ___. Select one: a. the alcohol produced from methane. b. the thiol produced from methane. c. methane. d. They all boil at the same temperature since methane is the basis for the compounds. Feedback The correct answer is: the alcohol produced from methane.
a. the alcohol produced from methane.
Aldehydes and ketones both contain a carbonyl carbon atom. They differ in that ___. Select one: a. the carbonyl carbon atom in ketones is attached to two other carbons and in aldehydes, the carbonyl carbon atom is also attached to at least one hydrogen atom. b. the carbonyl carbon atom in ketones is primary and in aldehydes, the carbonyl is secondary. c. the carbonyl carbon atom in ketones has a hydrogen attached to it. d. the carbonyl carbon atom in aldehydes has two carbon atoms attached to it Feedback The correct answer is: the carbonyl carbon atom in ketones is attached to two other carbons and in aldehydes, the carbonyl carbon atom is also attached to at least one hydrogen atom.
a. the carbonyl carbon atom in ketones is attached to two other carbons and in aldehydes, the carbonyl carbon atom is also attached to at least one hydrogen atom.
At physiological pH, most amino acids carry both a 1+ and 1- charge. This form is known as a ___. Select one: a. zwitterion b. anion c. cation d. isoelectric ion Feedback The correct answer is: zwitterion
a. zwitterion
A compound is a. two or more elements well mixed. b. two or more elements combined chemically. c. two or more elements carrying a positive charge. d. a physical blend of two or more elements.
b
Aluminum sulfate, Al2(SO4)3, can be used in water purification. What is the formula weight of this salt? a. 75.10 amu b. 342.30 amu c. 315.30 amu d. 150.10 amu
b
What is the formula of beryllium sulfide? a. BeS b. Be2S c. Be2S3 d. Be3S2
b
If ethene (H2C=CH2) were to react with water in an acid solution (H+ present), the result would be which of the following? Select one: a. b. c. d.
b.
Which compound is a hemiacetal? Select one: a. b. c. d.
b.
Which reaction is NOT an oxidation-reduction reaction? Select one: a. b. c. d. All of these are oxidation-reduction reactions
b.
Sodium fluoride is added to drinking water. A 25-L sample of city water contains 0.018 g NaF. Express this concentration in molarity. Select one: a. 0.000017 M b. 0.00072 M c. 0.018 M d. 18 M Feedback The correct answer is: 0.00072 M
b. 0.00072 M
Each of these is based on the propane molecule. Which is NOT capable of forming hydrogen bonds to another molecule of the same type? Select one: a. 1-propanol b. 1-propanethiol c. 2-propanol d. propanoic acid Feedback The correct answer is: 1-propanethiol
b. 1-propanethiol
The molecule CH4 has a tetrahedral shape. The angle between the bonds in CH4 is approximately ___. Select one: a. 104.5° b. 109.5° c. 90° d. 120°
b. 109.5°
When properly balanced with whole number coefficients, what is the coefficient on H2O? ____HCl + ____Ba(OH)2 ___BaCl2 + ___H2O Select one: a. 1 b. 2 c. 3 d. 6 Feedback The correct answer is: 2
b. 2
Which set of coefficients properly balance the equation below, going from reactants to products? Select one: a. 1,2,1,4 b. 2,1,1,2 c. 2,2,3,1 d. 1,2,2,1 Feedback The correct answer is: 2,1,1,2
b. 2,1,1,2
The number of covalent bonds that a nitrogen atom is expected to form is ___. Select one: a. 1 b. 3 c. 2 d. 4
b. 3
What is the IUPAC name of this compound? Select one: a. 4-methy-4-propylbutylaldehyde b. 4-methylhexanal c. 4-ethylpentanal d. 4-ethylpentylaldehyde Feedback The correct answer is: 4-methylhexanal
b. 4-methylhexanal
A gas occupies a volume of 8.60 L at 45C and 764 torr. What pressure would it occupy if the volume is adjusted to 13.3 L at 20C? Select one: a. 536 torr b. 455 torr c. 109 torr d. 188 torr Feedback The correct answer is: 455 torr
b. 455 torr
Pentose, C5H10O5, reacts with oxygen to produce carbon dioxide and water. What is the coefficient on O2 when the equation below is properly balanced? Select one: a. 3 b. 5 c. 7 d. 15
b. 5
Methanol burns in air according to the equation below. How many grams of methanol can be burned by 10 grams of oxygen? Select one: a. 2 g b. 7 g c. 10 g d. 20 g
b. 7 g
How many milliliters of 6.0 M HCl must be diluted to make 500.0 mL of a 0.10 M solution? Select one: a. 1.2 mL b. 8.3 mL c. 30. mL d. 300 mL Feedback The correct answer is: 8.3 mL
b. 8.3 mL
Identify the compound that is soluble in water. Select one: a. Ca(OH)2 b. Ba(NO3)2 c. AgCl d. Fe2(CO3)3 Feedback The correct answer is: Ba(NO3)2
b. Ba(NO3)2
If 2.00 grams of potassium are allowed to react with 2.00 grams of bromine by the following equation, which reactant is the limiting reactant? Select one: a. K b. Br2 c. cannot be determined Feedback The correct answer is: Br2
b. Br2
Which of the following is a binary compound? Select one: a. NaOH b. FeCl3 c. Ca 3(PO4)2 d. None of these choices is a binary compound.
b. FeCl3
Hyaluronic acid solutions serve as lubricants in the fluid of joints and are present in the vitreous humor of the eye. A portion of its structure is shown below. Which of the following statements is true? Select one: a. Hyaluronic acid is a homopolysaccharide. b. Hyaluronic acid is a heteropolysaccharide. c. Hyaluronic acid is made of D-glucose residues. d. The monosaccharide residues in hyaluronic acid are of furanose form. Feedback The correct answer is: Hyaluronic acid is a heteropolysaccharide.
b. Hyaluronic acid is a heteropolysaccharide.
Regarding the following reaction, Select one: a. This reaction does not involve oxidation or reduction. b. Magnesium is oxidized and nitrogen is reduced. c. Both magnesium and nitrogen are reduced. d. Magnesium is reduced and nitrogen is oxidized.
b. Magnesium is oxidized and nitrogen is reduced.
The formula for ammonium chloride is ___. Select one: a. AlCl3 b. NH4Cl c. NCl d. AmCl
b. NH4Cl
The formula for ammonium chloride is ___. a. AlCl3 b. NH4Cl c. NCl d. AmCl
b. NH4Cl
In which bond does the oxygen atom possess a partial positive charge? Select one: a. O-H b. O-F c. N-O d. O-C
b. O-F
Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce a thiol? Select one: a. OH- b. SH- c. I- d. -OCH3 Feedback The correct answer is: SH-
b. SH-
A reaction occurs in an acid solution during which two alcohol molecules react with a ketone. The product will be a(an) ___. Select one: a. ketose b. acetal c. alcoholic ketone d. acidic ketone Feedback The correct answer is: acetal
b. acetal
The peptide bond that connects amino acids in proteins is actually an ___ linkage. Select one: a. amine b. amide c. ether d. ester Feedback The correct answer is: amide
b. amide
The overall three-dimensional shape of a protein is determined by its ___ and is known as the ___ structure of a protein. Select one: a. amino acid residues/primary b. amino acid residues/tertiary c. isoelectric point/secondary d. hydrogen bonding/secondary Feedback The correct answer is: amino acid residues/tertiary
b. amino acid residues/tertiary
Which of the following substances recognized by immune system evoke production of one or more antibodies? Select one: a. secondary proteins b. antigens c. globular proteins d. glycolipids Feedback The correct answer is: antigens
b. antigens
Animal fats and vegetable oils become rancid when exposed to air because Select one: a. they are hydrogenated to form saturated fatty acids. b. carbon-carbon double bonds are oxidized in air, producing small organic molecules. c. they form amino acids in air. d. they are partially hydrogenated. Feedback The correct answer is: carbon-carbon double bonds are oxidized in air, producing small organic molecules.
b. carbon-carbon double bonds are oxidized in air, producing small organic molecules.
Which enzyme is involved in the conversion of arachidonic acid into prostaglandins and thromboxanes in the body? Select one: a. rybozymes b. cyclooxygenase c. transferases d. isomerases Feedback The correct answer is: cyclooxygenase
b. cyclooxygenase
The ability of an atom in a molecule to attract bonding electrons to itself is its ___. Select one: a. polarity b. electronegativity c. ionic nature d. bonding character
b. electronegativity
The ability of an atom in a molecule to attract bonding electrons to itself is its ___. a. polarity b. electronegativity c. ionic nature d. bonding character
b. electronegativity
Fructose is different from glucose and galactose because Select one: a. fructose is a pentose; the other sugars are hexoses. b. fructose is a ketose; the other sugars are aldoses. c. the cyclic form is a square; the other sugars display hexagons. d. fructose doesn't have an open form; the other sugars do have an open form. Feedback The correct answer is: fructose is a ketose; the other sugars are aldoses.
b. fructose is a ketose; the other sugars are aldoses.
Which of the following organic families is present in the molecule provided below? Select one: a. ether b. ketone c. aldehyde d. phenol
b. ketone
Which of the following organic families is present in the molecule provided below? a. ether b. ketone c. aldehyde d. phenol
b. ketone
Triglycerides composed of glycerin and mostly polyunsaturated fatty acid residues are likely to be ___ at room temperature. Select one: a. solid fats b. liquid oils c. gases d. waxes Feedback The correct answer is: liquid oils
b. liquid oils
When a person inhales air, Select one: a. lung volume decreases and lung pressure increases. b. lung volume increases and lung pressure decreases. c. lung volume decreases and lung pressure decreases. d. lung volume increases and lung pressure increases. Feedback The correct answer is: lung volume increases and lung pressure decreases.
b. lung volume increases and lung pressure decreases.
The fatty acid, palmitoleic acid, is Notice the double bond. Palmitoleic acid is a ___ fatty acid. Select one: a. saturated b. monounsaturated c. polyunsaturated d. waxy Feedback The correct answer is: monounsaturated
b. monounsaturated
The α-helix and β-pleated sheet are both forms of the ___ structure of proteins. Select one: a. primary b. secondary c. tertiary d. quaternary Feedback The correct answer is: secondary
b. secondary
Which of the following lipids is not derived from cholesterol? Select one: a. progesterone b. thromboxane c. cortisol d. testosterone Feedback The correct answer is: thromboxane
b. thromboxane
A compound is Select one: a. two or more elements well mixed. b. two or more elements combined chemically. c. two or more elements carrying a positive charge. d. a physical blend of two or more elements.
b. two or more elements combined chemically.
When a radioactive isotope emits a(n)___, its atomic number increases. Select one: a. alpha particle b. beta particle c. gamma ray d. positron
beta particle
Chose the formula of cobalt(II) nitrate. a. CoN b. Co2 NO3 c. Co(NO3)2 d. Co(II)(NO3)2
c
The correct condensed structure of Propylene glycol, a compound used as a solvent for drugs is a. CH3CH2CH2OH b. CH2HOHCOH2COHc. CH3 c. CH3-CH-OH OH CH3 d. CH3-CH-OH OH
c
The name of the compound N2O4 is a. nitrogen oxide. b. nitrogen tetroxide. c. dinitrogen tetroxide. d. nitrogen dioxide.
c
The proper name for P2O5 is a. acetate b. hydrogencarbonate (bicarbonate) c. carbonate d. cyanide
c
Which is the appropriate description of Sr2+? a. This is an atom and can be used to form chemical compounds. b. This is an atom with a charge of +2 because there are more neutrons than protons. c. This is an ion with a charge of +2 because there are two more protons than electrons. d. This is an ion with a charge of +2 because there are more electrons than protons.
c
The correct condensed structure of Propylene glycol, a compound used as a solvent for drugs is Select one: a. CH3CH2CH2OH b. CH2HOHCOH2COH c. d.
c.
What is the product of the reaction below? Select one: a. b. c. d.
c.
At what pressure would methane gas occupy 13.8 L if it occupies 5.74 L at 3.67 atm assuming constant temperature? Select one: a. 8.82 atm b. 21.6 atm c. 1.53 atm d. 11.3 atm Feedback The correct answer is: 1.53 atm
c. 1.53 atm
Shown here is the amino acid glycine at a pH of ___. Select one: a. 1 b. 7 c. 14 d. both 1 and 14 Feedback The correct answer is: 14
c. 14
What is the net charge on the oligopeptide in the figure shown here at pH 1? Select one: a. 3+ b. 1+ c. 2+ d. 0 Feedback The correct answer is: 2+
c. 2+
Which set of coefficients properly balance the equation below, going from reactants to products? Select one: a. 1,3,2,3 b. 1,7,4,3 c. 2,7,4,6 d. 2,3,2,3
c. 2,7,4,6
The concentration of calcium ion in blood is found to be 1.21 mmol/L. What is this concentration in mEq/L? Select one: a. 0.605 mEq/L b. 1.21 mEq/L c. 2.42 mEq/L d. 4.84 mEq/L Feedback The correct answer is: 2.42 mEq/L
c. 2.42 mEq/L
What is the volume of a mole of an ideal gas under standard conditions (STP)? Select one: a. 0.0821 liter b. 760 liters c. 22.4 liters d. 1.0 liter Feedback The correct answer is: 22.4 liters
c. 22.4 liters
How many stereoisomers would a carbohydrate with 5 chiral carbons have? Select one: a. 5 stereoisomers b. 20 stereoisomers c. 32 stereoisomers d. 60 stereoisomers Feedback The correct answer is: 32 stereoisomers
c. 32 stereoisomers
A chemist runs a reaction to prepare bromobenzene, C6H5Br, from the reaction of benzene (C6H6) with bromine(Br2): The theoretical yield of the reaction is 87 g of bromobenzene. If 68 g of bromobenzene are obtained, what is the percent yield of the reaction? Select one: a. 93% b. 81% c. 78 % d. 45% Feedback The correct answer is: 78 %
c. 78 %
How many grams of oxygen (O2) are needed to completely react with 24.0 g of propane (C3H8) according to the equation below? Select one: a. 0.545 g b. 2.73 g c. 87.2 g d. 28.8 g
c. 87.2 g
Which pairs of molecules can form a hydrogen bond with one another? Select one: a. NF3 b. CH3CH2CH2CH2CH3 c. CH3CH2NH2 d. CCl4
c. CH3CH2NH2
Chose the formula of cobalt(II) nitrate. Select one: a. CoN b. Co2 NO3 c. Co(NO3)2 d. Co(II)(NO3)2
c. Co(NO3)2
Which symbol is representative of a halide ion? a. He b. Ne c. I- d. Fe2+
c. I-
What is the formula of the ionic compound that forms between lithium ions and dichromate ions? Select one: a. LiCr2O7 b. Li3 Cr2O7 c. Li2 Cr2O7 d. Li4Cr2O7
c. Li2 Cr2O7
The net ionic equation for the reaction of sodium hydroxide, NaOH, and magnesium nitrate, Mg(NO3)2, contains which of the following species? Select one: a. 2Mg2+ (aq) b. Na+ c. Mg(OH)2 (s) d. NaNO3 (aq) Feedback The correct answer is: Mg(OH)2 (s)
c. Mg(OH)2 (s)
According to the octet rule, strontium (Sr) will form which of the following monoatomic ions? Select one: a. Sr2- b. Sr3+ c. Sr2+ d. Sr3-
c. Sr2+
Generally, the octet rule works fairly well for predicting the behavior of atoms. However, there is an exception: Select one: a. The halogens do not form ions on the basis of the octet rule. b. The alkali metals only conform to the octet rule when producing neutral atoms. c. The transition metals do not necessarily conform to the octet rule. d. The nonmetals do not conform to the octet rule.
c. The transition metals do not necessarily conform to the octet rule.
Omega-3 and Omega-6-fatty acids are essential fatty acids. Which of the following statement best describes these essential fatty acids? Select one: a. They are very soluble in water. b. They are saturated fatty acids that the body absorbs faster. c. They are not produced in the body and must be obtained through diet. d. They are waxes found in the body. Feedback The correct answer is: They are not produced in the body and must be obtained through diet.
c. They are not produced in the body and must be obtained through diet.
The structural formula for erythrose is drawn here. The carbon atoms are numbered from the carbonyl group. Select one: a. This is the only formula for erythrose; there are no stereoisomers. b. This is both a D and an L structure, as determined by carbons #1 and #2. c. This is D-erythrose, as determined by carbon #3. d. This is L-erythrose, as determined by carbon #4. Feedback The correct answer is: This is D-erythrose, as determined by carbon #3.
c. This is D-erythrose, as determined by carbon #3.
Which is the appropriate description of Sr2+? Select one: a. This is an atom and can be used to form chemical compounds. b. This is an atom with a charge of +2 because there are more neutrons than protons. c. This is an ion with a charge of +2 because there are two more protons than electrons. d. This is an ion with a charge of +2 because there are more electrons than protons.
c. This is an ion with a charge of +2 because there are two more protons than electrons.
If an aldehyde is oxidized, what type of compound would be produced? Select one: a. a ketone b. a different aldehyde c. a carboxylic acid d. an alcohol Feedback The correct answer is: a carboxylic acid
c. a carboxylic acid
If formaldehyde reacts with methanol in an acid solution, the product formed is ___. Select one: a. a new aldehyde b. an alcohol that is very polar c. a hemiacetal d. an acid Feedback The correct answer is: a hemiacetal
c. a hemiacetal
The ___ is the location on the protein molecule where enzyme catalyzed reactions take place. Select one: a. substrate b. zymogen c. active site d. coenzyme Feedback The correct answer is: active site
c. active site
An aldose is a carbohydrate that contains Select one: a. hydroxy groups on the terminal carbons. b. water molecules on the alpha carbon. c. an aldehyde group. d. monosaccharides. Feedback The correct answer is: an aldehyde group
c. an aldehyde group.
CO32- is the ___ ion. Select one: a. acetate b. hydrogencarbonate (bicarbonate) c. carbonate d. cyanide
c. carbonate
The disaccharides are important in nature; a few examples of disaccharides are Select one: a. D-abqueose, D-fructose, galactose, and glucose. b. raffinose, stachyose, and verbascose. c. cellobiose, lactose, maltose, and sucrose. d. amylopectin, amylose, and starch. Feedback The correct answer is: cellobiose, lactose, maltose, and sucrose.
c. cellobiose, lactose, maltose, and sucrose.
Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement. Select one: a. single replacement b. double replacement c. decomposition d. synthesis Feedback The correct answer is: decomposition
c. decomposition
Stereoisomers that are not mirror images of one another are called Select one: a. enantiomers b. anomers c. diastereomers d. Fischer projections Feedback The correct answer is: diastereomers
c. diastereomers
Anabolic steroids can cause some serious health problems including Select one: a. reduced circulation to the brain and liver. b. muscle atrophy and blocked arteries. c. high blood pressure and testicular atrophy. d. the interruption of nerve impulses and reduced intestinal function. Feedback The correct answer is: high blood pressure and testicular atrophy.
c. high blood pressure and testicular atrophy.
The function of an enzyme in a reaction is to Select one: a. cause a reaction to be reversible at the same reaction rate. b. increase the ∆G to increase the rate of reaction. c. increase the rate of reaction by reducing the activation energy. d. inhibit the reaction.
c. increase the rate of reaction by reducing the activation energy.
When the pressure is increased above 760 torr, the boiling point of water Select one: a. decreases to temperatures below 100 C. b. remains the same at 100C. c. increases to temperatures above. d. drops to temperatures below 0C. Feedback The correct answer is: increases to temperatures above.
c. increases to temperatures above.
Benzoyl peroxide can be used as a treatment for acne. Benzoyl peroxide Select one: a. has a reduction action that tends to neutralize the effects of the acne bacteria. b. is injected so that it will have a general immune action against bacteria causing acne. c. is an oxidizing agent used on the skin to kill the bacteria causing acne. d. is not used for acne; it is an antiseptic used to sterilize a surgeon's hands.
c. is an oxidizing agent used on the skin to kill the bacteria causing acne.
Waxes are compounds that are Select one: a. the result of the reaction of a fatty acid and sodium hydroxide. b. extremely hydrophilic due to the head end of the compound. c. mixtures of water insoluble compounds, especially esters. d. small compounds produced when short chain fatty acids react with an alcohol. Feedback The correct answer is: mixtures of water insoluble compounds, especially esters.
c. mixtures of water insoluble compounds, especially esters.
Serotonin is a molecule involved in the transmission of nerve impulses. One of the organic families present in serotonin is ___. Select one: a. ester b. alkyne c. phenol d. aldehyde
c. phenol
Shown below is the structure of the fatty acid, lauric acid: The boxed portion is considered to be both Select one: a. hydrophilic and hydrophobic. b. polar and hydrophobic. c. polar and hydrophilic. d. nonpolar and hydrophilic. Feedback The correct answer is: polar and hydrophilic.
c. polar and hydrophilic.
Eicosanoids are hormones derived from arachidonic acid. Which is not an eicosanoid? Select one: a. prostaglandin b. leukotriene c. progesterone d. thromboxane Feedback The correct answer is: progesterone
c. progesterone
Relative sweetness is a measure of the sweetness of any chosen sweetener compared to that of Select one: a. invert sugar. b. the sweetest carbohydrate, fructose. c. sucrose. d. saccharin. Feedback The correct answer is: sucrose.
c. sucrose.
Which of these contains the largest particles? Select one: a. solution b. colloid c. suspension d. solvent Feedback The correct answer is: suspension
c. suspension
If an amino acid is in a neutral solution, the form the carboxyl group takes is ___. Select one: a. —CO2- b. —CO2H+ c. —CO2- d. —CO2H Feedback The correct answer is: —CO2-
c. —CO2-
A compound commonly called trisodium phosphate, Na3PO4, is used to clean grease and other organic materials from concrete surfaces. Calculate the formula weight of this cleaner. a. 70.20 amu b. 116.70 amu c. 118.30 amu d. 164.00 amu
d
How many protons and electrons does Mg2+ have? a. 12 protons and 12 electrons b. 12 protons and 14 electrons c. 14 protons and 12 electrons d. 12 protons and 10 electrons
d
Nitrogen can have an anion, N3-. This ion a. is the result of the atom gaining three electrons. b. can form three ionic bonds. c. has eight electrons in the outside orbit. d. All of these choices are correct.
d
The equation: N2(g)+3H2(g)<=>2NH3(g) has the following equilibrium constant expression: Select one: a. b. c. d. Feedback The correct answer is: D
d
What is the proper name of the compound N2O3? a. nitrate b. nitrogen(II) oxide c. nitrogen trioxide d. dinitrogen trioxide
d
Which of the following is an anion? a. F b. Al3+ c. Mg d. I-
d
How many protons and electrons does Mg2+ have? Select one: a. 12 protons and 12 electrons b. 12 protons and 14 electrons c. 14 protons and 12 electrons d. 12 protons and 10 electrons
d. 12 protons and 10 electrons
A patient's blood test indicates that 1.00 mL of serum contains 0.00140 g of fibrinogen (a protein that aids in coagulation of blood). What is the concentration of the fibrinogen in mg/dL? Select one: a. 280 mg/dL b. 14 mg/dL c. 0.014 mg/dL d. 140. mg/dL Feedback The correct answer is: 140. mg/dL
d. 140. mg/dL
A compound commonly called trisodium phosphate, Na3PO4, is used to clean grease and other organic materials from concrete surfaces. Calculate the formula weight of this cleaner. Select one: a. 70.20 amu b. 116.70 amu c. 118.30 amu d. 164.00 amu
d. 164.00 amu
A gas cylinder at a pressure of 4408 torr contains a mixture of N2, O2, and helium gases. If the partial pressure of N2 gas is 1520 torr and the partial pressure of helium is 25 torr, what is the partial pressure of O2? Select one: a. 760 torr b. 4020 torr c. 5953 torr d. 2863 torr Feedback The correct answer is: 2863 torr
d. 2863 torr
The equivalent of 1 atmosphere of pressure is ___. Select one: a. 14.7 mm mercury b. 650 mm mercury c. 700 torr d. 760 torr Feedback The correct answer is: 760 torr
d. 760 torr
Nitrogen can have an anion, N3-. This ion Select one: a. is the result of the atom gaining three electrons. b. can form three ionic bonds. c. has eight electrons in the outside orbit. d. All of these choices are correct.
d. All of these choices are correct.
Organic compound must contain which of the following atoms? Select one: a. O b. H c. S d. C
d. C
What is the major organic product of the following reaction? Select one: a. CH3CH=CH2 b. CH3CH2CH2Cr c. CH3CH2CH3 d. CH3CH2CO2H Feedback The correct answer is: CH3CH2CO2H
d. CH3CH2CO2H
Which of the following bonds can be classified as polar? a. NaCl b. CH c. CsBr d. ClF
d. ClF
Which of the following is a fruit sugar? Select one: a. D-glucose b. Galactose c. Lactose d. D-Fructose Feedback The correct answer is: D-Fructose
d. D-Fructose
Which bond is least polar? Select one: a. H-F b. H-Cl c. H-Br d. H-I
d. H-I
Which atoms in the following molecule would have δ- charge based on the electronegativities of the elements? Select one: a. H and O b. O and C c. C and N d. N and O
d. N and O
Which atoms in the following molecule would have δ- charge based on the electronegativities of the elements? a. H and O b. O and C c. C and N d. N and O
d. N and O
A reducing agent found in some biological systems is ___. Select one: a. H2O2 b. acetaldehyde c. Pt d. NADH Feedback The correct answer is: NADH
d. NADH
Which of the following contains a nonpolar covalent bond? a. LiBr b. CaCl2 c. H2O d. O2
d. O2
What was the earliest reported method of fighting infection in the operating room? Select one: a. The patient was treated with Betadine before surgery. b. Carbolic acid was used on the surgeon's tools. c. Listerine was the antiseptic of choice. d. The surgeons washed with soap and chlorine water. Feedback The correct answer is: The surgeons washed with soap and chlorine water.
d. The surgeons washed with soap and chlorine water.
The following molecule belongs to which family of compounds? Select one: a. alcohols b. Ethers c. sulfides d. Thiols
d. Thiols
The following molecule belongs to which family of compounds? a. alcohols b. Ethers c. sulfides d. Thiols
d. Thiols
The name for the Ti4+ ion is Select one: a. Tin ion. b. Tin (IV) ion. c. Titanium ion. d. Titanium (IV) ion.
d. Titanium (IV) ion.
A prodrug is Select one: a. used because it is less expensive than the regular medication. b. a more professional type of medication than is normally used. c. the metabolic result of normal bodily processes on commonly available materials. d. a precursor of a drug that is converted by metabolic processes to that drug. Feedback The correct answer is: a precursor of a drug that is converted by metabolic processes to that drug. Correct
d. a precursor of a drug that is converted by metabolic processes to that drug.
How would this compound be classified? Select one: a. carboxylic carbohydrate b. hydroxyaldehyde c. ketotriose d. aldotriose Feedback The correct answer is: aldotriose
d. aldotriose
Which is a means of denaturing a protein? Select one: a. changes in temperature b. changes in pH c. use of detergents or soaps d. all of these choices Feedback The correct answer is: all of these choices
d. all of these choices
Ethyl alcohol (CH3CH2OH) is completely soluble in water. It is made of both polar and non-polar groups. Ethyl alcohol is best classified as a(n) ___ substance. Select one: a. hydrophilic b. hydrophobic c. lipophilic d. amphipathic Feedback The correct answer is: amphipathic
d. amphipathic
Glycogen and amylopectin are similar in that they are both polymers of glucose. Glycogen is the glucose storage form for ___ and starch is the glucose storage form for ___. Select one: a. plants/plants b. animals/animals c. plants/animals d. animals/plants Feedback The correct answer is: animals/plants
d. animals/plants
Shown below is a cyclic form of D-mannose. This structure is classified as ___. Select one: a. a-D-mannopyranose b. b-D-mannofuranose c. a-D-mannofuranose d. b-D-mannopyranose Feedback The correct answer is: b-D-mannopyranose
d. b-D-mannopyranose
D-glucose is often called by other names, such as corn sugar and grape sugar. It is also referred to as ___. Select one: a. dextrose b. fruit sugar c. blood sugar d. dextrose and blood sugar Feedback The correct answer is: dextrose and blood sugar
d. dextrose and blood sugar
The common name for CH3-O-CH3 is ___. Select one: a. methanal b. dimethanol c. ethyl ether d. dimethyl ether Feedback The correct answer is: dimethyl ether
d. dimethyl ether
Identify the class of lipid to which the following molecule belongs. Select one: a. sphingophospholipid b. triglyceride c. cholesterol d. glycerophospholipid Feedback The correct answer is: glycerophospholipid
d. glycerophospholipid
The reaction below is an example of a ___ reaction. Select one: a. hydrogenation b. hydrolysis c. dehydration d. hydration
d. hydration
What is the classification of this monosaccharide? Select one: a. aldopentose b. aldohexose c. ketopentose d. ketohexose Feedback The correct answer is: ketohexose
d. ketohexose
Sphingomyelins are found in ___. Select one: a. waxes b. egg whites c. skin cells d. nerve cell membranes Feedback The correct answer is: nerve cell membranes
d. nerve cell membranes
The formation of ions typically occurs when Select one: a. nonmetal atoms lose electrons and metals gain them. b. metal and nonmetal atoms are close together in the number of valence electrons. c. metal and nonmetal atoms have the same number of electrons. d. nonmetal atoms gain electrons and metal atoms lose them.
d. nonmetal atoms gain electrons and metal atoms lose them.
The formation of ions typically occurs when a. nonmetal atoms lose electrons and metals gain them. b. metal and nonmetal atoms are close together in the number of valence electrons. c. metal and nonmetal atoms have the same number of electrons. d. nonmetal atoms gain electrons and metal atoms lose them.
d. nonmetal atoms gain electrons and metal atoms lose them.
A certain enzyme's name is glucose-6-phosphorylase. This enzyme most likely catalyzes a reaction that Select one: a. converts glucose into six phosphorous atoms. b. synthesizes six glucose molecules. c. joins six glucose molecules to a phosphate. d. places a phosphate on the sixth carbon of glucose. Feedback The correct answer is: places a phosphate on the sixth carbon of glucose.
d. places a phosphate on the sixth carbon of glucose.
Some proteins require more than one polypeptide chain to be biologically active. The level of protein structure involved is the ___ of a protein. Select one: a. primary b. secondary c. tertiary d. quaternary Feedback The correct answer is: quaternary
d. quaternary
The glycolipid molecule is characterized by having a specific residue attached to the backbone. Which is that residue? Select one: a. phosphate b. glycerol c. lipid d. sugar Feedback The correct answer is: sugar
d. sugar
Standard temperature and pressure corresponds to Select one: a. temperature of 0C and pressure of 1 psi. b. temperature of 25C and pressure of 1 atm. c. temperature of 0C and pressure of 2 psi. d. temperature of 0C and pressure of 1 atm. Feedback The correct answer is: temperature of 0C and pressure of 1 atm.
d. temperature of 0C and pressure of 1 atm.
Aspartic acid is classified as a polar-acidic amino acid due to Select one: a. the —CH group to which the amide group is attached. b. the —CH2 group in the middle of the side chain. c. the amide group located on a side chain. d. the carboxyl group located on the side chain. Feedback The correct answer is: the carboxyl group located on the side chain.
d. the carboxyl group located on the side chain.
In a homogeneous mixture Select one: a. the substances are not evenly distributed. b. the substances are always liquid. c. the substances are always solids. d. the substances are uniformly distributed. Feedback The correct answer is: the substances are uniformly distributed.
d. the substances are uniformly distributed.
If you have a toothache and the dentist taps your tooth to check for sensitivity, what part of the scientific method is being used? Select one: a. experiment b. hypothesis c. theory d. law
experiment
Which form of ionizing radiation is most penetrating? Select one: a. alpha b. beta c. gamma d. positron
gamma
A patient who has undergone a PET scan that used fluorine-18 tagged glucose is likely to emit which of the following a few hours after the procedure? Select one: a. x-rays b. alpha particles c. gamma radiation d. beta particles
gamma radiation
What is the proper name of the compound FePO4? Select one: a. iron phosphide b. iron(III) phosphide c. iron(III) phosphate d. iron phosphorus tetraoxide
iron(III) phosphate
Whereas x-ray works well for bones, the value of a CT scan is that Select one: a. it provides a 3 dimensional view of bones. b. it provides images of the inside of the body. c. it provides a clear picture of gamma rays produced within the tissue. d. it provides images used in studies, such as monitoring sugar usage.
it provides a 3 dimensional view of bones.
Water flowing over a dam is an example of Select one: a. potential energy. b. chemical energy. c. electrical energy. d. kinetic energy.
kinetic energy.
Scientific laws differ from scientific theories in that Select one: a. laws explain observations and theories describe observations. b. laws describe observations and theories explain observations. c. theories eventually become laws. d. No difference exists. Laws and theories have the same meaning.
laws explain observations and theories describe observations.
Which of the following is a physical change? Select one: a. melting of ice b. burning oxygen in air c. rusting of iron d. baking cookies
melting of ice
Subatomic particle with a positive charge is a(n) ___. Select one: a. electron b. neutron c. proton d. cation
proton
The dosage unit related to the amount of energy absorbed by an object exposed to nuclear radiation is ___. Select one: a. curie b. rad c. rem d. Becquerel
rad
The higher up within a group or family on the periodic table, Select one: a. the heavier the nucleus. b. the more the element is likely to conduct electricity. c. the more nonmetallic in character. d. the more the element is likely to be a semimetal.
the more nonmetallic in character.
Radioisotopes with short half-lives are used in diagnostic tests because Select one: a. they have high energy. b. they are inexpensive. c. they do not pose health risks by being present long after use. d. they have less penetration ability.
they do not pose health risks by being present long after use.
Mass number refers to Select one: a. total number of protons and electrons. b. total number of protons. c. total number of neutrons and protons. d. total number of neutrons and electrons.
total number of neutrons and protons.
Atoms of elements belonging to the same group have an identical number of Select one: a. total electrons. b. energy levels. c. inner electrons. d. valence electrons.
valence electrons.