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Test Bank - Biochemistry, 9th Edition (Berg and Stryer, 2020), Chapter 1-36 | All Chapters
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 gi gi gi gi gi gi gi giName: Class: Date: gi
Chapter 2 gi
1. What is NOT a key property that enable proteins to participate in a wide range of functions?
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
a. Proteins have a high molecular weight. gi gi gi gi gi
b. Proteins contain different functional groups.
gi gi gi gi
c. Some proteins are quite rigid, whereas others display considerable flexibility.
gi gi gi gi gi gi gi gi gi
d. Proteins are linear polymers built of different amino acids.
gi gi gi gi gi gi gi gi
e. Proteins can interact with one another and with other biological macromolecules to form comple
gi gi gi gi gi gi gi gi gi gi gi gi gi
xassemblies.
i
g
ANSWER: a gi
2. What does an α-amino acid consist of?
gi gi gi gi gi gi
a. carbonyl group, α carbon, amino group, oxygen atom, distinctive R group
gi gi gi gi gi gi gi gi gi gi
b. carboxylic acid group, α carbon, amino group, hydrogen atom, distinctive R group
gi gi gi gi gi gi gi gi gi gi gi
c. carboxylic acid group, ε carbon, nitro group, hydrogen atom
gi gi gi gi gi gi gi gi
d. alcohol group, α carbon, amino group, nitrogen atom, distinctive R group, hydrogen atom
gi gi gi gi gi gi gi gi gi gi gi gi
e. carboxylic acid group, δ carbon, imine radical, hydrogen atom, distinctive R group
gi gi gi gi gi gi gi gi gi gi gi
ANSWER: b gi
3. What isomers of amino acids are found in proteins and what absolute configuration do they have?
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
a. L isomer; R absolute configuration
gi gi gi gi
b. D and L isomers; R absolute configuration
gi gi gi gi gi gi
c. L isomer; S absolute configuration
gi gi gi gi
d. D isomer; S absolute configuration
gi gi gi gi
e. L and D isomers; S absolute configuration
gi gi gi gi gi gi
ANSWER: c gi
4. In an acidic solution (pH = 1), what is the ionization state of an amino acid?
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
a. The amino group is deprotonated; the carboxyl group is protonated.
gi gi gi gi gi gi gi gi gi
b. The amino group is not dissociated; the carboxyl group is not dissociated.
gi gi gi gi gi gi gi gi gi gi gi
c. The amino group is protonated; the carboxyl group is deprotonated.
gi gi gi gi gi gi gi gi gi
d. The amino group is protonated; the carboxyl group is not dissociated.
gi gi gi gi gi gi gi gi gi gi
e. The amino group is deprotonated; the carboxyl group is not dissociated.
gi gi gi gi gi gi gi gi gi gi
ANSWER: d gi
5. Choose the correct groups for Thr, Lys, His, Met, respectively, on the basis of general chemica
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
lcharacteristics.
gi
a. polar but uncharged; negatively charged; positively charged; hydrophobic
gi gi gi gi gi gi gi
b. polar but uncharged; positively charged; positively charged; hydrophobic
gi gi gi gi gi gi gi
c. positively charged; hydrophobic; polar but not charged; positively charged
gi gi gi gi gi gi gi gi
d. negatively charged; hydrophobic; positively charged; polar but not charged
gi gi gi gi gi gi gi gi
e. positively charged; positively charged; polar but not charged; negatively charged
gi gi gi gi gi gi gi gi gi
ANSWER: b gi
CopyrightgiMacmillangiLearning.giPoweredgibygiCogner Pagegi1
o.
mynursytest.store
, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg gi gi gi gi gi gi gi gi
Name: Class: Date: gi
Chapter 2 gi
6. Which amino acid has the one-letter abbreviation K?
gi gi gi gi gi gi gi
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER: e gi
7. Choose the statement that does NOT reflect why a particular set of 20 amino acids becomes the buildin
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
gblock of proteins.
gi gi gi
a. Other possible amino acids may have simply been too reactive.
gi gi gi gi gi gi gi gi gi
b. The rings in their cyclic forms are too big.
gi gi gi gi gi gi gi gi
c. They provide proteins with the versatility to assume many functional roles.
gi gi gi gi gi gi gi gi gi gi
d. Many of these amino acids were probably available from prebiotic reactions.
gi gi gi gi gi gi gi gi gi gi
e. As a set, they are diverse.
gi gi gi gi gi
ANSWER: b gi
8. The amide bond is a linkage between the:
gi gi gi gi gi gi gi
a. β-amino group of one amino acid and the α-amino group of another amino acid.
gi gi gi gi gi gi gi gi gi gi gi gi gi
b. β-carboxyl group of one amino acid and the β-amino group of another amino acid.
gi gi gi gi gi gi gi gi gi gi gi gi gi
c. δ-carboxyl group of one amino acid and the α-carboxyl group of another amino acid.
gi gi gi gi gi gi gi gi gi gi gi gi gi
d. α-amino group of one amino acid and the ε-amino group of another amino acid.
gi gi gi gi gi gi gi gi gi gi gi gi gi
e. α-carboxyl group of one amino acid and the α-amino group of another amino acid.
gi gi gi gi gi gi gi gi gi gi gi gi gi
ANSWER: e gi
9. What is the amino-terminal residue and what is the carboxyl-
gi gi gi gi gi gi gi gi gi
terminal residue in the sequence of amino acidsGly-Tyr-Gly-Phe-Leu?
gi gi gi gi gi gi gi i
g
a. Leucine is N-terminal and glycine is C-terminal.
gi gi gi gi gi gi
b. Glycine is N-terminal and leucine is C-terminal.
gi gi gi gi gi gi
c. Tyrosine is N-terminal and leucine is C-terminal. gi gi gi gi gi gi
d. Phenylalanine is N-terminal and leucine is C-terminal. gi gi gi gi gi gi
e. There are no N-terminal and C-terminal residues in the sequences of amino acids.
gi gi gi gi gi gi gi gi gi gi gi gi
ANSWER: b gi
10. Oligopeptide is a polypeptide chain made of: gi gi gi gi gi gi
a. numerous amino acids. gi gi
b. amino acids with a low molecular weight.
gi gi gi gi gi gi
c. positively charged amino acids. gi gi gi
d. small numbers of amino acids. gi gi gi gi
e. negatively charged amino acids. gi gi gi
CopyrightgiMacmillangiLearning.giPoweredgibygiCogner Pagegi2
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mynursytest.store
, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg gi gi gi gi gi gi gi gi
Name: Class: Date: gi
Chapter 2 gi
ANSWER: d gi
11. A protein with a molecular weight of 75 550 g mol–
gi gi gi gi gi gi gi gi gi gi
1g i
has a mass of:a. 75,550 Da or 755.5 kDa.
gi gi gi gi gi gi gi gi gi
b. 7555 Da or 75.55 kDa.
gi gi gi gi gi
c. 75,550 Da or 75.55 kDa.
gi gi gi gi gi
d. 755,500 Da or 7.555 kDa.
gi gi gi gi gi
e. 7,555,000 Da or 75550 kDa.
gi gi gi gi gi
ANSWER: c gi
12. Knowledge of the amino acid sequences is important for several reasons. What is NOT one of thos
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
ereasons?
gi
a. Amino acid sequences determine the three-dimensional structures of proteins.
gi gi gi gi gi gi gi gi
b. The sequence of a protein reveals much about its evolutionary history.
gi gi gi gi gi gi gi gi gi gi
c. Knowledge of the sequence of a protein can help to prevent mutations.gi gi gi gi gi gi gi gi gi gi gi
d. Changes in the amino acid sequence can lead to abnormal protein functioning and disease.
gi gi gi gi gi gi gi gi gi gi gi gi gi
e. The sequence of a protein is necessary to determine its function.
gi gi gi gi gi gi gi gi gi gi
ANSWER: c gi
13. Choose atoms that lie in a plane in a pair of linked amino acids.
gi gi gi gi gi gi gi gi gi gi gi gi gi
a. Cα3, C, O, N, Cα2 gi gi gi gi
b. Cα, C, N, H, Cα2 gi gi gi gi
c. Cα, C, O, N, H, Cα3 gi gi gi gi gi
d. Cα, Cα2, Cα3, N, H, C gi gi gi gi gi
e. Cα, C, O, N, H, Cα2 gi gi gi gi gi
ANSWER: e gi
14. Which statement CORRECTLY describe a peptide bond?
gi gi gi gi gi gi
a. The C–N distance in a peptide bond is 1.49 Å; the peptide bond is positively charged.
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi
b. The C– gi
N distance in a peptide bond is 1.27 Å; the bond resonates between a single bond and adouble
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi i
g
bond; the peptide bond is negatively charged.
gi gi gi gi gi gi gi
c. The C– gi
N distance in a peptide bond is 1.32 Å; the bond resonates between a double bond and a triplebond; t
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi i
g gi
he peptide bond is a kind of dipole.
gi gi gi gi gi gi gi
d. The C– gi
N distance in a peptide bond is 1.35 Å; the bond resonates between a single bond and a triplebond; t
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi i
g gi
he peptide bond is a kind of dipole.
gi gi gi gi gi gi gi
e. The C– gi
N distance in a peptide bond is 1.30 Å; the bond resonates between a double bond and a triplebond; t
gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi gi i
g gi
he peptide bond is positively charged.
gi gi gi gi gi
CopyrightgiMacmillangiLearning.giPoweredgibygiCogner Pagegi3
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