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Test Bank - Biochemistry, 9th Edition (Berg and Stryer, 2020), Chapter 1-36 | All Chapters
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, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg ci ci ci ci ci ci ci ciName: Class: Date: ci
Chapter 2 ci
1. What is NOT a key property that enable proteins to participate in a wide range of functions?
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a. Proteins have a high molecular weight. ci ci ci ci ci
b. Proteins contain different functional groups.
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c. Some proteins are quite rigid, whereas others display considerable flexibility.
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d. Proteins are linear polymers built of different amino acids.
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e. Proteins can interact with one another and with other biological macromolecules to form complex
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assemblies.
ANSWER: a ci
2. What does an α-amino acid consist of?
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a. carbonyl group, α carbon, amino group, oxygen atom, distinctive R group
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b. carboxylic acid group, α carbon, amino group, hydrogen atom, distinctive R group
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c. carboxylic acid group, ε carbon, nitro group, hydrogen atom ci ci ci ci ci ci ci ci
d. alcohol group, α carbon, amino group, nitrogen atom, distinctive R group, hydrogen atom
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e. carboxylic acid group, δ carbon, imine radical, hydrogen atom, distinctive R group
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ANSWER: b ci
3. What isomers of amino acids are found in proteins and what absolute configuration do they have?
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a. L isomer; R absolute configuration
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b. D and L isomers; R absolute configuration
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c. L isomer; S absolute configuration
ci ci ci ci
d. D isomer; S absolute configuration
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e. L and D isomers; S absolute configuration
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ANSWER: c ci
4. In an acidic solution (pH = 1), what is the ionization state of an amino acid?
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
a. The amino group is deprotonated; the carboxyl group is protonated.
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b. The amino group is not dissociated; the carboxyl group is not dissociated.
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c. The amino group is protonated; the carboxyl group is deprotonated.
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d. The amino group is protonated; the carboxyl group is not dissociated.
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e. The amino group is deprotonated; the carboxyl group is not dissociated.
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ANSWER: d ci
5. Choose the correct groups for Thr, Lys, His, Met, respectively, on the basis of general chemical
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characteristics.
a. polar but uncharged; negatively charged; positively charged; hydrophobic
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b. polar but uncharged; positively charged; positively charged; hydrophobic
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c. positively charged; hydrophobic; polar but not charged; positively charged
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d. negatively charged; hydrophobic; positively charged; polar but not charged
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e. positively charged; positively charged; polar but not charged; negatively charged
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ANSWER: b ci
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, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg ci ci ci ci ci ci ci ci
Name: Class: Date: ci
Chapter 2 ci
6. Which amino acid has the one-letter abbreviation K?
ci ci ci ci ci ci ci
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER: e ci
7. Choose the statement that does NOT reflect why a particular set of 20 amino acids becomes the building
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block of proteins.
ci ci
a. Other possible amino acids may have simply been too reactive.
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b. The rings in their cyclic forms are too big.
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c. They provide proteins with the versatility to assume many functional roles.
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d. Many of these amino acids were probably available from prebiotic reactions.
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e. As a set, they are diverse.
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ANSWER: b ci
8. The amide bond is a linkage between the:
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a. β-amino group of one amino acid and the α-amino group of another amino acid.
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b. β-carboxyl group of one amino acid and the β-amino group of another amino acid.
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c. δ-carboxyl group of one amino acid and the α-carboxyl group of another amino acid.
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d. α-amino group of one amino acid and the ε-amino group of another amino acid.
ci ci ci ci ci ci ci ci ci ci ci ci ci
e. α-carboxyl group of one amino acid and the α-amino group of another amino acid.
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ANSWER: e ci
9. What is the amino-terminal residue and what is the carboxyl-
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terminal residue in the sequence of amino acidsGly-Tyr-Gly-Phe-Leu?
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a. Leucine is N-terminal and glycine is C-terminal.
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b. Glycine is N-terminal and leucine is C-terminal.
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c. Tyrosine is N-terminal and leucine is C-terminal. ci ci ci ci ci ci
d. Phenylalanine is N-terminal and leucine is C-terminal. ci ci ci ci ci ci
e. There are no N-terminal and C-terminal residues in the sequences of amino acids.
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ANSWER: b ci
10. Oligopeptide is a polypeptide chain made of: ci ci ci ci ci ci
a. numerous amino acids. ci ci
b. amino acids with a low molecular weight.
ci ci ci ci ci ci
c. positively charged amino acids. ci ci ci
d. small numbers of amino acids. ci ci ci ci
e. negatively charged amino acids. ci ci ci
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, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg ci ci ci ci ci ci ci ci
Name: Class: Date: ci
Chapter 2 ci
ANSWER: d ci
11. A protein with a molecular weight of 75 550 g mol–
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1c i
has a mass of:a. 75,550 Da or 755.5 kDa.
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b. 7555 Da or 75.55 kDa.
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c. 75,550 Da or 75.55 kDa.
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d. 755,500 Da or 7.555 kDa.
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e. 7,555,000 Da or 75550 kDa.
ci ci ci ci ci
ANSWER: c ci
12. Knowledge of the amino acid sequences is important for several reasons. What is NOT one of those
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reasons?
a. Amino acid sequences determine the three-dimensional structures of proteins.
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b. The sequence of a protein reveals much about its evolutionary history.
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c. Knowledge of the sequence of a protein can help to prevent mutations. ci ci ci ci ci ci ci ci ci ci ci
d. Changes in the amino acid sequence can lead to abnormal protein functioning and disease.
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e. The sequence of a protein is necessary to determine its function.
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ANSWER: c ci
13. Choose atoms that lie in a plane in a pair of linked amino acids.
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a. Cα3, C, O, N, Cα2 ci ci ci ci
b. Cα, C, N, H, Cα2 ci ci ci ci
c. Cα, C, O, N, H, Cα3 ci ci ci ci ci
d. Cα, Cα2, Cα3, N, H, C
ci ci ci ci ci
e. Cα, C, O, N, H, Cα2 ci ci ci ci ci
ANSWER: e ci
14. Which statement CORRECTLY describe a peptide bond?
ci ci ci ci ci ci
a. The C–N distance in a peptide bond is 1.49 Å; the peptide bond is positively charged.
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b. The C– ci
N distance in a peptide bond is 1.27 Å; the bond resonates between a single bond and adouble
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bond; the peptide bond is negatively charged.
ci ci ci ci ci ci
c. The C– ci
N distance in a peptide bond is 1.32 Å; the bond resonates between a double bond and a triplebond; t
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he peptide bond is a kind of dipole.
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d. The C– ci
N distance in a peptide bond is 1.35 Å; the bond resonates between a single bond and a triplebond; t
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he peptide bond is a kind of dipole.
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e. The C– ci
N distance in a peptide bond is 1.30 Å; the bond resonates between a double bond and a triplebond; t
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he peptide bond is positively charged.
ci ci ci ci ci
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