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Solutions manual and Test Bank for Biochemistry 9th Edition Berg.
Solutions manual and Test Bank for Biochemistry 9th Edition Berg.
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Solutions manual and Test Bank for Biochemistry9th Edition Berg
Name: Class: Date:
Chapter 2
1. What is NOT a key property that enable proteins to participate in a wide range of functions?
a. Proteins have a high molecular weight.
b. Proteins contain different functional groups.
c. Some proteins are quite rigid, whereas others display considerable flexibility.
d. Proteins are linear polymers built of different amino acids.
e. Proteins can interact with one another and with other biological macromolecules to form complex
assemblies. ANSWER: a
2. What does an α-amino acid consist of?
a. carbonyl group, α carbon, amino group, oxygen atom, distinctive R group
b. carboxylic acid group, α carbon, amino group, hydrogen atom, distinctive R group
c. carboxylic acid group, ε carbon, nitro group, hydrogen atom
d. alcohol group, α carbon, amino group, nitrogen atom, distinctive R group, hydrogen atom
e. carboxylic acid group, δ carbon, imine radical, hydrogen atom, distinctive R group ANSWER: b
3. What isomers of amino acids are found in proteins and what absolute configuration do they have? a.
L isomer; R absolute configuration
b. D and L isomers; R absolute configuration
c. L isomer; S absolute configuration
d. D isomer; S absolute configuration
e. L and D isomers; S absolute configuration ANSWER: c
4. In an acidic solution (pH = 1), what is the ionization state of an amino acid?
a. The amino group is deprotonated; the carboxyl group is protonated.
b. The amino group is not dissociated; the carboxyl group is not dissociated.
c. The amino group is protonated; the carboxyl group is deprotonated.
d. The amino group is protonated; the carboxyl group is not dissociated.
e. The amino group is deprotonated; the carboxyl group is not dissociated. ANSWER: d
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Name: Class: Date:
Chapter 2
5. Choose the correct groups for Thr, Lys, His, Met, respectively, on the basis of general chemical
characteristics.
a. polar but uncharged; negatively charged; positively charged; hydrophobic
b. polar but uncharged; positively charged; positively charged; hydrophobic
c. positively charged; hydrophobic; polar but not charged; positively charged
d. negatively charged; hydrophobic; positively charged; polar but not charged
e. positively charged; positively charged; polar but not charged; negatively charged ANSWER: b
6. Which amino acid has the one-letter abbreviation K?
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER: e
7. Choose the statement that does NOT reflect why a particular set of 20 amino acids becomes the building
block of proteins.
a. Other possible amino acids may have simply been too reactive.
b. The rings in their cyclic forms are too big.
c. They provide proteins with the versatility to assume many functional roles.
d. Many of these amino acids were probably available from prebiotic reactions. e. As a set, they
are diverse. ANSWER: b
8. The amide bond is a linkage between the:
a. β-amino group of one amino acid and the α-amino group of another amino acid.
b. β -carboxyl group of one amino acid and the β-amino group of another amino acid.
c. δ-carboxyl group of one amino acid and the α-carboxyl group of another amino acid.
d. α -amino group of one amino acid and the ε-amino group of another amino acid.
e. α-carboxyl group of one amino acid and the α-amino group of another amino acid. ANSWER: e
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