biochem final
A general method for preparing alcohols is the Select one: a. hydration of alkenes b. combustion of ethers c. hydrogenation of alkenes d. combustion of alkanes
a
Another name for p-diisopropylbenzene is Select one: a. 1,4-diisopropylbenzene b. 1,5-diisopropylbenzene c. 1,2-diisopropylbenzene d. 1,3-diisopropylbenzene
a
Carboxylic acid salts may be converted to their "parent" carboxylic acids by reacting them with Select one: a. a strong acid such as HBr b. a phenol c. a weak base such as ammonia d. an alcohol such as ethanol
a
Cis-trans isomerism is possible for which of the following alkenes? Select one: a. CH3-CH=CH-CH2-CH2-CH3 b. CH3-CH=CH2 c. CH2=CH-CH2-CH2-CH3 d. CH2=CH-CH2-CH3
a
For the following pair of compounds, select a correct structural characterization from the response list: 1,3-butanediol and methyl isopropyl ether. Select one: a. have the same number of carbon atoms but a different number of oxygen atoms b. are constitutional isomers c. have the same number of oxygen atoms but a different number of carbon atoms d. have the same number of carbon atoms and the same number of oxygen atoms but are not constitutional isomers
a
For the following reaction situation, select a correct product characterization using the response list: 1-hexyne + one Cl2 Select one: a. dichlorinated alkene b. dichlorinated alkane c. monochlorinated alkene d. monochlorinated alkane
a
For which of the following halogenated cycloalkanes is cis-trans isomerism possible? Select one: a. 1-bromo-2-chlorocyclobutane b. 1-bromo-1-chlorocyclobutane c. more than one correct response d. 1,1-dichlorocyclobutane
a
Hydrolysis of an acetal in an acid solution would yield Select one: a. an aldehyde or a ketone, and two alcohol molecules b. an aldehyde or a ketone, and one alcohol molecule c. an aldehyde, a ketone, and one alcohol molecule d. an aldehyde, a ketone, and two alcohol molecules
a
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: Statements: (1) Mirror images of an achiral molecule are identical. (2) All cyclic monosaccharides can exist in alpha- and beta-configurations. (3) Reaction of an alcohol with a cyclic monosaccharide produces a glycoside. Select one: a. All three statements are true b. Two of the three statements are true c. Only one of the three statements is true d. None of the statements are true
a
In which of the following alkanes are 10 carbon atoms present? Select one: a. more than one correct response b. 3-ethyl-2,4-dimethylpentane c. 3,4-diethylhexane d. 2,3-dimethyloctane
a
R-group interaction between which of the following pairs of amino acids produces a disulfide bond? Select one: a. cysteine-cysteine b. proline-proline c. alanine-glycine d. cysteine-glycine
a
The bonding in benzene differs from that of other unsaturated hydrocarbons in that each carbon atom participates in Select one: a. three single bonds and one "delocalized" bond b. three single bonds and three double bonds c. one single bond and three double bonds d. one single bond and one "delocalized" bond
a
The designation "monounsaturated" applies to which of the following fatty acids? Select one: a. oleic acid (18:1) b. palmitic acid (16:0) c. arachidonic acid (20:4) d. no correct response
a
The distinction between a saturated hydrocarbon and an unsaturated hydrocarbon relates to Select one: a. the number of multiple bonds present in the molecule b. volatility c. boiling points d. number of carbon atoms present
a
The four hydrogen atoms bonded to the central carbon atom in methane lie at the corners or apexes of a Select one: a. tetrahedron b. rectangle c. square d. parallelogram
a
The left- and right-handed forms of a monosaccharide with more than one chiral center are Select one: a. enantiomers b. diasteromers c. epimers d. more than one correct response
a
The reduction of monosaccharides produces Select one: a. sugar alcohols b. sugar acids c. monosaccharides d. disaccharides
a
Waxes are lipids derived from Select one: a. a long-chain alcohol and a long-chain fatty acid b. glycerol and three fatty acids c. glycerol, fatty acids, phosphate, and an amino alcohol d. sphingosine, fatty acids, phosphate, and an amino alcohol
a
What is the name for this three-carbon alkyl group? CH3 - CH - CH3 | Select one: a. isopropyl b. sec-butyl c. propyl d. tert-butyl
a
What is the number of different amino acids produced by complete hydrolysis of the pentapeptide: Gly-Ala-Gly-Gly-Ala. Select one: a. Two b. One c. Three d. Zero
a
When an alcohol molecule adds across a carbon-oxygen double bond of an aldehyde or ketone, the Select one: a. OR portion from the alcohol bonds to the carbonyl carbon atom b. OH portion from the alcohol bonds to the carbonyl carbon atom c. H atom from the alcohol bonds to the carbonyl carbon atom d. OH portion from the alcohol bonds to the carbonyl oxygen atom
a
When an ester undergoes saponification, one reaction product is Select one: a. a carboxylic acid salt b. water c. a ketone d. a carboxylic acid
a
Which of the following compounds could have the molecular formula C7H16? Select one: a. 2,3-dimethylpentane b. pentane c. hexane d. 2-methylheptane
a
Which of the following could not be the molecular formula for an alkane molecule? Select one: a. C5H14 b. C24H50 c. C4H10 d. CH4
a
Which of the following is an incorrect IUPAC name for a cycloalkane? Select one: a. 3-Isopropylcyclopentane b. Propylcyclopentane c. 1,2-Dimethylcyclopentane d. Cyclobutane
a
Which of the following is an omega-6 fatty acid? Select one: a. CH3−(CH2)4−CH=CH−(CH2)12−COOH b. CH3−(CH2)18−COOH c. CH3−CH2−CH=CH−(CH2)5−COOH d. CH3−(CH2)7−CH=CH−(CH2)7−COOH
a
Which of the following properties would be the different for a pair of enantiomeric monosaccharides? Select one: a. interaction with a chiral solvent b. melting point c. density d. no correct response
a
Which of the following statements concerning the D- and L- forms of a monosaccharide is correct? Select one: a. They have structures that are nonsuperimposable mirror images of each other b. They contain a different number of chiral centers c. They are diastereomers d. more than one correct response
a
A carbohydrate that gives two molecules when it is completely hydrolyzed is known as a Select one: a. monosaccharide b. disaccharide c. polysaccharide d. more than one correct response
b
Carbon atoms always have how many covalent bonds? Select one: a. two b. four c. three d. one
b
Carbon tetrachloride has a polar C-Cl bond. What is the overall polarity of the carbon tetrachloride molecule? Select one: a. strongly polar b. nonpolar c. reversed polarity d. weakly polar
b
For the following compound, which is denoted using skeletal structural formulas, select from the response list the number of hydrogen atoms present in the compound. cyclohexane Select one: a. 10 H atoms b. 12 H atoms c. 8 H atoms d. 14 H atoms
b
For the following pair of compounds, select a correct structural characterization from the response list: 2-Methyl-3-hexanol and 2-Ethyl-2-pentanol. Select one: a. have the same number of oxygen atoms but a different number of carbon atoms b. are constitutional isomers c. have the same number of carbon atoms but a different number of oxygen atoms d. have the same number of carbon atoms and the same number of oxygen atoms but are not constitutional isomers
b
For the pair of compounds, select a correct characterization from the response list: o-diethylbenzene and 1,3-diethylbenzene. Select one: a. both exist as cis-trans isomers b. are constitutional isomers c. one but not the other exists in cis-trans forms d. have the same number of carbon atoms but are not constitutional isomers
b
In a condensed structural formula, each carbon atom is Select one: a. shown with all individual atoms and bonds drawn. b. grouped with its bonded hydrogen atoms. c. shown with only the other carbon atoms. d. not explicitly shown.
b
In a secondary alcohol, the hydroxyl-bearing carbon atom (Hint: draw a secondary alcohol) Select one: a. is always involved in a double bond. b. is attached to two other carbon atoms. c. cannot be bonded to hydrogen atoms. d. more than one correct response
b
The designation "polyunsaturated" applies to which of the following fatty acids? Select one: a. oleic acid (18:1) b. arachidonic acid (20:4) c.palmitic acid (16:0) d. more than one correct response
b
The increased boiling point of ketones compared to alkanes and ethers of similar mass is due to Select one: a. hydrogen bonding b. dipole-dipole interactions c. a bent chain structure d. ionic interactions
b
The oxidation of monosaccharides produces Select one: a. sugar alcohols b. sugar acids c. monosaccharides d. disaccharides
b
The products of the acid catalyzed hydrolysis of a fat are Select one: a. the esters of fatty acids b. fatty acids and glycerol c. salts of fatty acids d. salts of fatty acids and glycerol
b
The reaction of an alkene and water in the presence of an acid catalyst to produce an alcohol is called Select one: a. halogenation b. hydration c. hydrolysis d. hydrohydration
b
UPAC alkene for the following molecule is: ch3-CH-ch=ch-ch3 ch3 IUPAC alkene Select one: a. 2-methylpentene b. 4-methyl-2-pentene c. 2-methyl-3-pentene d. 2-methyl-3,4-pentene
b
What is the correct molecular formula for 2,2-dimethylbutane? Select one: a. C6H12 b. C6H14 c. C8H18 d. C8H16
b
What is the name of the compound below? Select one: a. 2-chloro-1-benzene b. 2-chlorotoluene c. 1-chlorotoluene d. 1-chloro-2-benzene
b
Which of the following is NOT typical of most organic compounds? Select one: a. high flammability b. high melting point c. poor solubility in water d. covalent bonding
b
Which of the following properties would be the same for D-ribulose and L-ribulose? Select one: a. interaction with plane-polarized light b. boiling point c. solubility in a chiral solvent d. reaction with (+)-2,3-pentanediol
b
Which of the following statements concerning chiral centers in specific monosaccharides is incorrect? Select one: a. Glyceraldehyde, an aldotriose, has one chiral center. b. Dihydroxyacetone, a ketotriose, has two chiral centers. c. Mannose, an aldohexose, has four chiral centers. d. Tagatose, a ketohexose, has three chiral centers
b
A basic amino acid has an R group that contains Select one: a. an alcohol group b. a thiol group c. an amine group d. a carboxyl group
c
Compared to saturated fatty acids, unsaturated fatty acids have Select one: a. greater intermolecular attraction b. higher melting points c. lower melting points d. shorter carbon chains
c
Constitutional isomerism is possible between members of which of the following types of compounds? Select one: a. amides and carboxylic acids b. more than one correct response c. primary amines and secondary amines d. amines and amides
c
Constitutional isomerism is possible in alkanes only if the number of carbon atoms present is Select one: a. an odd number b. an even number c. four or more d. five or more
c
Ethers may be viewed as derivatives of water in which both hydrogen atoms have been replaced with Select one: a. hydroxyl groups b. more than one correct response c. hydrocarbon groups d. alkoxy groups
c
For the following reaction situation, select a correct product characterization using the response list: 1,3-cyclohexadiene + one Cl2 Select one: a. trichlorinated hydrocarbon b. tetrachlorinated hydrocarbon c. dichlorinated hydrocarbon d. monochlorinated hydrocarbon
c
For the pair of compounds, select a correct characterization from the response list: 2-pentene and 2-butene. Select one: a. are constitutional isomers b. have the same number of carbon atoms but are not constitutional isomers c. both exist as cis-trans isomers d. one but not the other exists in cis-trans forms
c
For which of the following intramolecular alcohol dehydrations is Zaitsev's rule needed to predict the structure of the alkene formed in the greatest amount? Select one: a. 2-propanol b. 1-butanol c. no correct response d. 1-propanol
c
Glycine is the only naturally occurring amino acids that is Select one: a. in the D-form b. neutral c. achiral d. positively charged
c
How many carbonyl-containing isomers does the formula C3H6O have? Select one: a. five b. three c. two d. four
c
Hydrogenation, with a catalyst, of which of the following compounds would produce a four-carbon alcohol? Hint: Hydrogenation is adding two H atoms (this is a reduction reaction). Select one: a. butanal b. 2-butanone c. more than one correct response d. diethylketone
c
In a disaccharide, two monosaccharides are joined by what kind of bond? Select one: a. double b. anomeric c. glycosidic d. alcohol
c
In the oxidation of fats and oils, which structural part of the molecule is attacked by the oxidizing agent? Select one: a. ester linkages b. carbon-carbon single bonds c. carbon-carbon double bonds d. no correct response
c
In the tetrapeptide Phe-Gln-Trp-His, the C-terminal amino acid is: Select one: a. Gin b. Trp c. His d. Phe
c
In which of the following pairs of alkanes are the two members of the pair constitutional isomers? Select one: a. ethane and propane b. hexane and 3-methylhexane c. 3-methylnonane and 3,4-dimethyloctane d. 2,4-dimethylhexane and 2,4-dimethylheptane
c
Margarine containing partially hydrogenated soybean oil is solid because Select one: a. it contains only saturated fats b. it contains only trans fats c. some of its double bonds have been converted to single bonds d. it contains only cis double bonds
c
Match the following structural formula with compound types in the response list: CH3-S-CH3. Select one: a. thiol b. diol c. thioether d. disulfide
c
The common name for the compound CH3-CH2-CH2-NH2 is Select one: a. N-aminopropane b. aminopropane c. propylamine d. N-propylamine
c
The reaction of butane with oxygen is called Select one: a. neutralization. b. addition. c. combustion. d. substitution.
c
The reduction of 3-pentanone with molecular hydrogen (H2) in the presence of a nickel catalyst will yield Select one: a. 2-pentene b. diethyl alcohol c. 3-pentanol d. pentanaldehyde
c
Which of the following conditions for an alcohol dehydration reaction with H2SO4 as the catalyst will produce an ether? Select one: a. 3° alcohol, 180°C b. 1° alcohol, 180°C c. 1° alcohol, 140°C d. 3° alcohol, 140°C
c
Which of the following lipids will give a single molecule of fatty acid when hydrolyzed? Select one: a. glycolipid b. phospholipid c. wax d. fat
c
Which of the following statements concerning aldehydes and ketones is correct? Select one: a. Neither cyclic aldehydes nor cyclic ketones exist. b. No cyclic ketones exist. c. No cyclic aldehydes exist. d. Both cyclic aldehydes and cyclic ketones exist.
c
Which of the following statements concerning the structure of phenols is incorrect? Select one: a. A hydroxyl group is part of the structure b. A benzene ring is part of the structure c. A methyl group is part of the structure d. No correct response
c
he reaction of hydrogen (H2) and propene using a platinum catalyst is called Select one: a. substitution. b. combustion. c. addition. d. condensation.
c
A cycloalkene having only one carbon-carbon double bond will have the general formula Select one: a. CnH2n+2 b. CnH2n c. CnH2n-4 d. CnH2n-2
d
A cycloalkene having two carbon-carbon double bonds will have the general formula Select one: a. CnH2n-2 b. CnH2n-6 c. CnH2n d. CnH2n-4
d
According to Markovnikov's rule, the hydrogen in HOH (water) adds to the carbon in the double bond Select one: a. that has the greater number of carbon atoms attached. b. that has the smaller number of hydrogen atoms attached. c. attached to the end carbon. d. that has the greater number of hydrogen atoms attached.
d
Alkylation of a primary amine, under basic conditions, will produce Select one: a. a primary ammonium salt b. a primary amine c. an amide d. a secondary amine
d
All of the carbon-carbon bonds in benzene are Select one: a. composed of only two types, single and double b. circular bonds c. double bonds d. identical
d
Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) Cis-trans isomers have the same molecular formula and also the same structural formula. (2) Molecules of the compound 1,3-dichlorocyclohexane contain 12 hydrogen atoms. (3) The product from the reaction of one molecule of ethane with one molecule of Br2 is 1,2-dibromoethane. Select one: a. None of the statements is true. b. Two of the three statements are true. c. All three statements are true. d. Only one of the statements is true.
d
Cis-trans isomerism is possible for which of the following alkenes? Select one: a. CH2=CH-CH2-CH3 b. CH2=CH-CH2-CH2-CH3 c. CH3-CH=CH2 d. CH3-CH=CH-CH2-CH3
d
Determine the structural level (primary, secondary, etc.) associated with the alpha-helix configuration. Select one: a. primary structure b. quaternary structure c. tertiary structure d. secondary structure
d
Esters are produced through the reaction of Select one: a. a ketone and an ether b. a carboxylic acid and an aldehyde c. a ketone and an alcohol d. an alcohol and a carboxylic acid
d
For the following reaction situation, select a correct product characterization using the response list: Benzene + two Cl2 Select one: a. monochlorinated hydrocarbon b. tetrachlorinated hydrocarbon c. trichlorinated hydrocarbon d. dichlorinated hydrocarbon
d
For the following reaction, select a correct product characterization from the response list. ch2=ch-ch3+hcl -> Select one: a. An alkene is formed. b. A cycloalkane is formed. c. An alkane is formed. d. Markovnikov's rule is needed to predict the major organic product.
d
For the following reaction, select a correct product characterization from the response list. ch2=ch-ch=ch2+h2 ---ni---> Select one: a. Markovnikov's rule is needed to predict the major organic product. b. A cycloalkene is formed. c. An alkane is formed. d. An alkene is formed.
d
For which of the following halogenated cycloalkanes is cis-trans isomerism possible? Select one: a. 1-bromo-1-chlorocyclobutane b. 1,1-dichlorocyclobutane c. no correct response d. 1-bromo-2-chlorocyclobutane
d
From the response list, select the correct molecular formula for 1,2-dimethylcyclobutane. Select one: a. C6H16 b. C6H10 c. C6H14 d. C6H12
d
How many subunits are present in a triacylglycerol molecule? Select one: a. one b. two c. three d. four
d
In a typical amino acid zwitterion, the carboxylate end is Select one: a. attached to the amine b. positively charged c. neutral d. negatively charged
d
In terms of chemical reactivity, ethers resemble Select one: a. alkenes b. alcohols c. phenols d. alkanes
d
The hydrogenation of 2-Methylpropanal gives the product: Select one: a. 2-methyl-3-propanol b. 1-butanol c. 2-methyl-2-propanol d. 2-methyl-1-propanol
d
The hydrogenation of an alkene gives a(n) Select one: a. alkene. b. alkyne. c. isomer. d. alkane.
d
The joining together of two amino acids to form a dipeptide involves the reaction between: Select one: a. two amide groups b. an alpha-carbon and a hydroxyl group c. an amino group and an alpha-carbon d. an amino group and a carboxyl group
d
The structural difference between a hemiacetal and an acetal is the replacement of Select one: a. an H atom with an -OR group b. a -OR group with a -OH group c. an H atom with a -OH group d. a -OH group with an -OR group
d
There are three 5-carbon alkane constitutional isomers. Their molecular formulas are, respectively, Select one: a. C5H11, C5H12, C5H13 b. C5H10, C5H12, C5H14 c. C5H12, C5H13, C5H14 d. C5H12, C5H12, C5H12
d
Under which of the following conditions would hydrolysis of an amide produce an amine as one of the products? Select one: a. neutral conditions b. acidic conditions c. basic conditions d. more than one correct response
d
Unsaturated fatty acids have lower melting points than saturated fatty acids because Select one: a. they have more hydrogen atoms b. they have fewer hydrogen atoms c. their molecules fit closely together d. the cis double bond(s) give them an irregular shape
d
When naming an alkene, the parent chain is the longest carbon chain Select one: a. that does not contain the double bond. b. regardless of whether or not it contains the double bond. c. that contains at least one of the carbon atoms of the double bond. d. that contains both atoms of the double bond.
d
Which of the following compounds is a constitutional isomer of 2-pentanone? Select one: a. 3-methyl-2-pentanone b. 3-methyl-2-butanone c. isopropyl methyl ketone d. more than one correct response
d
Which of the following is an omega-3 fatty acid? Select one: a. CH3−(CH2)18−COOH b. CH3−(CH2)7−CH=CH−(CH2)7−COOH c. CH3−(CH2)4−CH=CH−(CH2)12−COOH d. CH3−CH2−CH=CH−(CH2)5−COOH
d
Which of the following is true of nonane, C9H20, which has a density of 0.79 g/mL, melts at -51 °C, and boils at 157 °C? Select one: a. Nonane is a gas at room temperature. b. Nonane is soluble in water. c. Nonane does not undergo combustion. d. Nonane floats on the surface of water.
d
