Chapter 2 A&P Practice Test

40 ) What does CH4 mean ? A ) There is one carbon and four hydrogen atoms . B ) There are four carbon and four hydrogen atoms . C ) This is an inorganic molecule . D ) This was involved in a redox reaction .

A) There is one carbon and four hydrogen atoms

41 ) Amino acids joining together to make a peptide is a good example of a ( n ) reaction . A ) synthesis B ) decomposition C ) exchange D ) reversible

A) synthesis

19 ) Which statement about enzymes is false ? A ) Enzymes require contact with substrate in order to assume their active form . B ) Enzymes have the ability to accelerate reactions as much as a billion - fold . C ) Enzymes may use coenzymes derived from vitamins or cofactors from metallic elements . D ) Enzymes may be damaged by high temperature .

A: Enzymes reauire contact with substrate in order to assume their active form

11 ) Salts are always A ) ionic compounds B ) single covalent compounds C ) double covalent compounds D ) hydrogen bonded

A: Ionic compounds

21 ) Choose the answer that best describes HCO3- . A ) a bicarbonate ion B ) common in the liver C ) a weak acid D ) a proton donor

A: a bicarbonate ion

23 ) What happens in redox reactions ? A ) both decomposition and electron exchange occur B ) the electron acceptor is oxidized C ) the organic substance that loses hydrogen is usually reduced D ) the reaction is uniformly reversible

A: both decomposition and electron exchange occur

22 ) Select which reactions will usually be irreversible regarding chemical equilibrium in human bodies . A ) glucose to CO2 and H₂O B ) ADP + Pi to make ATP C ) H₂O + CO2 to make H2CO3 D ) glucose molecules joined to make glycogen

A: glucose to CO2 and H2O

28 ) Select the correct statement about isotopes . A ) Isotopes of the same element have the same atomic number but differ in their atomic masses . B ) All the isotopes of an element have the same number of neutrons but differing numbers of electrons . C ) All the isotopes of an element are radioactive . D ) Isotopes occur only in the heavier elements .

A: isotopes of the same element have the same atomic number but differ in their atomic masses

10 ) A chemical reaction in which bonds are broken is usually associated with A ) the release of energy B ) the consumption of energy C ) a synthesis D ) forming a larger molecule

A: the release of energy

9 ) Which of the following is not a role of molecular chaperonins ? A ) prevent accidental , premature , or incorrect folding of polypeptide chains B ) aid the desired folding and association process of polypeptides C ) help to translocate proteins and certain metal ions across cell membranes D ) promote the breakdown of damaged or denatured proteins E ) act as a platform for assembling primary protein structure

Answer: E

44 ) Sucrose is a A ) monosaccharide B ) disaccharide C ) polysaccharide D ) triglyceride

B) Disaccharide

48 ) Which bonds often bind different parts of a molecule into a specific three - dimensional shape ? A ) Carbon B ) Hydrogen C ) Oxygen D ) Amino acid

B) Hydrogen

39 ) What is a dipole ? A ) a type of bond B ) a polar molecule C ) a type of reaction D ) an organic molecule

B) a polar molecule

43 ) Which property of water is demonstrated when we sweat ? A ) high heat capacity B ) high heat of vaporization C ) polar solvent properties D ) reactivity E ) cushioning

B) high heat of vaporization

46 ) In a DNA molecule , the phosphate serves _______. A ) as a code B ) to hold the molecular backbone together . C ) to bind the sugars to their bases D ) as nucleotides

B) to hold the molecular backbone together

26 ) Select the most correct statement regarding nucleic acids . A ) Three forms exist : DNA , RNA , and tDNA . B ) DNA is a long , double - stranded molecule made up of A , T , G , and C bases . C ) RNA is a long , single - stranded molecule made up of the bases A , T , G , and C. D ) tDNA is considered a molecular slave of DNA during protein synthesis .

B: DNA is a long, double stranded molecule made up of A,T,G and C bases

33 ) Which protein types are vitally important to cell function in all types of stressful circumstances ? A ) structural proteins B ) molecular chaperones C ) catalytic proteins D ) regulatory proteins

B: Molecular chaperones

17 ) What level of protein synthesis is represented by the coiling of the protein chain backbone into an alpha helix ? A ) primary structure B ) secondary structure C ) tertiary structure D ) quaternary structure

B: Secondary structure

35 ) What does the formula C6H1206 mean ? A ) There are 6 calcium , 12 hydrogen , and 6 oxygen atoms . B ) There are , 6 carbon , 12 hydrogen , and 6 oxygen atoms . C ) The molecular weight is 24 . D ) The substance is a colloid .

B: There are 6 carbon, 12 hydrogen and 6 oxygen atoms

24 ) Choose the answer that best describes fibrous proteins . A ) rarely exhibit secondary structure B ) are very stable and insoluble in water C ) are usually called enzymes D ) are cellular catalysts

B: are very stable and insoluble in water

4) The genetic information is coded in DNA by the_______. A)regular alteration of sugar and phosphate molecules B)sequence of the nucleotides C)three dimensional stucture of the double helix D)arrangement of the histones

B: sequence of the nucleotides

45 ) What is the ratio of fatty acids to glycerol in neutral fats ? A ) 1 : 1 B ) 2 : 1 C ) 3 : 1 D ) 4 : 1

C) 3:1

38 ) The chemical symbol O=O means A ) zero equals zero B ) both atoms are bonded and have zero electrons in the outer orbit C ) the atoms are double bonded D ) this is an ionic bond with two shared electrons

C) the atoms are double bonded

36 ) An atom with a valence of 3 may have a total of electrons . A ) 3 B ) 8 C ) 13 D ) 17

C: 13

32 ) Atom X has 17 protons . How many electrons are in its valence shell ? A ) 3 B ) 5 C ) 7 D ) 10

C: 7

34 ) If atom X has an atomic number of 74 it would have which of the following ? A ) 37 protons and 37 neutrons B ) 37 electrons C ) 74 protons D ) 37 protons and 37 electrons

C: 74 protons

6) The single most abundant protein in the body is______. A)DNA B)Hemoglobin C)Collagen D)Glucose

C: Collagen

7) Carbohydrates are stored in the liver and muscles in the form of_____. A)Glucose B)Triglycerides C)Glycogen D)Cholesterol

C: Glycogen

20 ) Which of the following statements is false ? A ) Chemical reactions proceed more quickly at higher temperatures . B ) Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers . C ) Larger particles move faster than smaller ones and thus collide more frequently and more forcefully . D ) Catalysts increase the rate of chemical reactions , sometimes while undergoing reversible changes in shape .

C: Larger particles move faster than smaller ones and thus collide more frequently and more forcefully

16 ) What is a chain of more than 50 amino acids called ? A ) polypeptide B ) polysaccharide C ) protein D ) nucleic acid

C: Protein

2) The basic structural material of the body consists of______. A)Carbohydrates B)Lipids C)Proteins D)Nucleic acids

C: Proteins

5) Which of the following is not true of proteins? A)They may be denatured or coagulated by heat or acidity. B)The have both functional and structural roles in the body. C)The appear to be the molecular carriers of coded hereditary information. D)Their function depends on their three-dimensional shape.

C: They appear to be the molecular carriers of coded hereditary information.

13 ) Which of the following statements is false ? A ) When acids and bases are mixed , they react with each other to form water and a salt . B ) The more hydrogen ions in a solution , the more acidic the solution . C ) When the hydrogen ion concentration decreases , the hydroxyl ion concentration also decreases . D ) The pH of blood is slightly basic .

C: When the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases

31 ) 31 ) You notice that you cannot read your book through a test tube of patient fluid held of the beaker , though it has been sitting for several days in a rack . What type of liquid is this ? against the print , making it so blurred as to be unreadable . There is no precipitant in the bottom A ) solution B ) suspension C ) colloid D ) mixture

C: calloid

29 ) The four elements that make up about 96 % of body matter are A ) carbon , oxygen , phosphorus , calcium B ) nitrogen , hydrogen , calcium , sodium C ) carbon , oxygen , hydrogen , nitrogen D ) sodium , potassium , hydrogen , oxygen

C: carbon, oxygen, hydrogen, nitrogen

18 ) Carbohydrates and proteins are built up from their basic building blocks by the A ) addition of a water molecule between each two units B ) addition of a carbon atom between each two units C ) removal of a water molecule between each two units D ) removal of a carbon atom between each two units

C: removal of a water molecule between each two units

37 ) Which of the following is a neutralization reaction ? A ) HCl → H + + Cl- B ) NaOH → Na + + OH- C ) NH3 + H + —> NH4 + 2 D ) HCI + NaOH → NaCl + H2O

D ) HCI + NaOH → NaCl + H2O

47 ) Stress proteins are a type of protein called A ) coenzymes B ) cofactors C ) eicosanoids D ) chaperones

D) chaperones

42 ) Which of the following is not considered a factor in influencing a reaction rate ? A ) temperature B ) concentration C ) particle size D) time

D) time

12 ) The numbers listed represent the number of electrons in the first , second , and third energy levels , respectively . On this basis , which of the following is an unstable or reactive atom ? A ) 2 , 8 , 8 B ) 2,8 C ) 2 D ) 2 , 8 , 1

D: 2, 8, 1

15 ) Which of the following would be regarded as an organic molecule ? A ) H₂O B ) NaCl C ) NaOH D ) CH4

D: CH4

8) Which of the following does NOT describe enzymes? A)Some enzymes are purely protein B)Some enzymes are protein plus a cofactor C)Each enzyme is chemically specific D)Enzymes work by raising the energy of activation

D: Enzymes work by raising the energy of activation

1) Which if the following elements is necessary for proper conduction of nervous impulses? A) Fe B) I C) P D) Na

D: Na

14 ) Which of the following is the major positive ion outside cells ? A ) magnesium B ) hydrogen C ) potassium D ) sodium

D: Sodium

30 ) is fat soluble , produced in the skin on exposure to UV radiation , and necessary for normal bone growth and function . A ) Vitamin K B ) Cortisol C ) Vitamin A D ) Vitamin D

D: Vitamin D

3) In general, the lipids that we refer to as oils have_______. A)a high water content B)long fatty acid chains C)a high degree of saturated bonds D)a high degree of unsaturated bonds

D: a high degree of unsaturated bonds

27 ) Which of the following is an example of a suspension ? A ) cytoplasm B ) salt water C ) rubbing alcohol D ) blood

D: blood

25 ) Which of the following does not describe uses for the ATP molecule ? A ) chemical work B ) mechanical work C ) transport across membranes D ) pigment structure

D: pigment structure