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Test Bank - Biochemistry, 9th Edition (Berg and Stryer, 2020), Chapter 1-36 | All Chapters
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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 l; l; l; l; l; l; l; l;Name: Class: Date: l;
Chapter 2 l;
1. What is NOT a key property that enable proteins to participate in a wide range of functions?
l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l;
a. Proteins have a high molecular weight. l; l; l; l; l;
b. Proteins contain different functional groups. l; l; l; l;
c. Some proteins are quite rigid, whereas others display considerable flexibility.
l; l; l; l; l; l; l; l; l;
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 complexas
l; l; l; l; l; l; l; l; l; l; l; l; l; l;
semblies.
ANSWER: a l;
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
l; l; l; l; l; l; l; l; l; l; l;
c. carboxylic acid group, ε carbon, nitro group, hydrogen atom l; l; l; l; l; l; l; l;
d. alcohol group, α carbon, amino group, nitrogen atom, distinctive R group, hydrogen atom
l; l; l; l; l; l; l; l; l; l; l; l;
e. carboxylic acid group, δ carbon, imine radical, hydrogen atom, distinctive R group
l; l; l; l; l; l; l; l; l; l; l;
ANSWER: b l;
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
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d. D isomer; S absolute configuration
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e. L and D isomers; S absolute configuration
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ANSWER: c l;
4. In an acidic solution (pH = 1), what is the ionization state of an amino acid?
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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 l;
5. Choose the correct groups for Thr, Lys, His, Met, respectively, on the basis of general chemicalch
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aracteristics.
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 l;
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, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg l; l; l; l; l; l; l; l;
Name: Class: Date: l;
Chapter 2 l;
6. Which amino acid has the one-letter abbreviation K?
l; l; l; l; l; l; l;
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER: e l;
7. Choose the statement that does NOT reflect why a particular set of 20 amino acids becomes the buildingbl
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ock of proteins.
l; l;
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 l;
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.
l; l; l; l; l; l; l; l; l; l; l; l; l;
b. β-carboxyl group of one amino acid and the β-amino group of another amino acid. l; l; l; l; l; l; l; l; l; l; l; l; l;
c. δ-carboxyl group of one amino acid and the α-carboxyl group of another amino acid. l; l; l; l; l; l; l; l; l; l; l; l; l;
d. α-amino group of one amino acid and the ε-amino group of another amino acid.
l; l; l; l; l; l; l; l; l; l; l; l; l;
e. α-carboxyl group of one amino acid and the α-amino group of another amino acid. l; l; l; l; l; l; l; l; l; l; l; l; l;
ANSWER: e l;
9. What is the amino-terminal residue and what is the carboxyl-
l; l; l; l; l; l; l; l; l;
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. l; l; l; l; l; l;
b. Glycine is N-terminal and leucine is C-terminal. l; l; l; l; l; l;
c. Tyrosine is N-terminal and leucine is C-terminal. l; l; l; l; l; l;
d. Phenylalanine is N-terminal and leucine is C-terminal. l; l; l; l; l; l;
e. There are no N-terminal and C-terminal residues in the sequences of amino acids.
l; l; l; l; l; l; l; l; l; l; l; l;
ANSWER: b l;
10. Oligopeptide is a polypeptide chain made of: l; l; l; l; l; l;
a. numerous amino acids. l; l;
b. amino acids with a low molecular weight. l; l; l; l; l; l;
c. positively charged amino acids. l; l; l;
d. small numbers of amino acids. l; l; l; l;
e. negatively charged amino acids. l; l; l;
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, DOWNLOAD THE Test Bank for Biochemistry 9th Edition Berg l; l; l; l; l; l; l; l;
Name: Class: Date: l;
Chapter 2 l;
ANSWER: d l;
11. A protein with a molecular weight of 75 550 g mol–
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1l ;
has a mass of:a. 75,550 Da or 755.5 kDa.
l; l; l; l; l; l; l; l; l;
b. 7555 Da or 75.55 kDa.
l; l; l; l; l;
c. 75,550 Da or 75.55 kDa.
l; l; l; l; l;
d. 755,500 Da or 7.555 kDa.
l; l; l; l; l;
e. 7,555,000 Da or 75550 kDa.
l; l; l; l; l;
ANSWER: c l;
12. Knowledge of the amino acid sequences is important for several reasons. What is NOT one of thosere
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asons?
a. Amino acid sequences determine the three-dimensional structures of proteins.
l; l; l; l; l; l; l; l;
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. l; l; l; l; l; l; l; l; l; l; l;
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.
l; l; l; l; l; l; l; l; l; l;
ANSWER: c l;
13. Choose atoms that lie in a plane in a pair of linked amino acids.
l; l; l; l; l; l; l; l; l; l; l; l; l;
a. Cα3, C, O, N, Cα2 l; l; l; l;
b. Cα, C, N, H, Cα2 l; l; l; l;
c. Cα, C, O, N, H, Cα3 l; l; l; l; l;
d. Cα, Cα2, Cα3, N, H, Cl; l; l; l; l;
e. Cα, C, O, N, H, Cα2 l; l; l; l; l;
ANSWER: e l;
14. Which statement CORRECTLY describe a peptide bond?
l; l; l; l; l; l;
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– l;
N distance in a peptide bond is 1.27 Å; the bond resonates between a single bond and adouble bo
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nd; the peptide bond is negatively charged.
l; l; l; l; l; l;
c. The C– l;
N distance in a peptide bond is 1.32 Å; the bond resonates between a double bond and a triplebond; the
l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l;
peptide bond is a kind of dipole. l; l; l; l; l; l;
d. The C– l;
N distance in a peptide bond is 1.35 Å; the bond resonates between a single bond and a triplebond; the
l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l;
peptide bond is a kind of dipole. l; l; l; l; l; l;
e. The C– l;
N distance in a peptide bond is 1.30 Å; the bond resonates between a double bond and a triplebond; the
l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l; l;
peptide bond is positively charged. l; l; l; l;
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