MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
Exam 1 version A - structure and function
Many types of non-covalent interactions are electrostatic in
nature; one notable exception is
A) Hydrogen bond
C) Ionic interaction
B) Van der Waals interaction
D) Hydrophobic interaction - Correct Answers ✅D
2. Maintaining correct pH is very important for living systems.
Which of the following molecules is
important for pH control in living systems?
A) Proteins, especially those with high content of histidine
residues
B) Dihydrogen phosphate and hydrogen phosphate
C) Bicarbonate
D) All of the above - Correct Answers ✅D
3. While many biochemists use the terms "aspartate" and
"aspartic acid" interchangeably, they do refer to
different things. Which of the following regarding these two
terms is true?
A) Aspartate is the conjugate base of aspartic acid.
,MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
B) Aspartate is converted to aspartic acid upon an increase in
pH.
C) Aspartic acid is converted to aspartate upon a decrease in
pH.
D) All of the above. - Correct Answers ✅A
4. Most likely, the diagram on the right illustrates
A) A hydrogen bond formed between a base-pair
B) A hydrogen bond formed between two adjacent beta-
strands
C) An ionic interaction between two adjacent alpha helices
D) A hydrogen bond formed between two adjacent alpha
helices - Correct Answers ✅picture
B
5. Change in pH can alter the charge status of protein
molecules in aqueous solution. For example, as pH
decreases, protein molecules in aqueous solution tend to
become
A) More protonated and more positively charged
B) Less protonated and more negatively charged
C) More stable and active
D) None of the above - Correct Answers ✅A
,MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
6. Val, Leu, Ile, and Thr are considered as essential amino
acids for humans, meaning we have to get
them from our diet. Structurally, what is a common feature
shared by those four essential amino acids?
A) They all have a polar side chain
B) They all have a non-polar side chain
C) They all have a branched side chain
D) They all have an acidic side chain - Correct Answers ✅C
7. The chemical structure shown on the right is the side chain
of _______________,
which can function as a _________________ in the active site of
an enzyme.
A) Proline; hydrogen bond acceptor
B) Histidine; proton acceptor
C) Tyrosine; hydrogen bond acceptor
D) Histidine; proton donor - Correct Answers ✅picture
B
8. Cystine is formed via
A) Reduction of disulfide bond
B) Oxidation of the side chain of two cysteines
C) Dimerization between a cysteine and a tyrosine
, MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
D) Dimerization between a cysteine and a methionine -
Correct Answers ✅B
9. Which of the following statements is true regarding the two
amino acids shown on the right?
A) Both can be synthesized using pyruvate as a direct
precursor
B) Both can be synthesized using oxaloacetate as a direct
precursor
C) The one on the left but not the one on the right can be
synthesized using pyruvate as a direct precursor
D) Both are D-aspartate - Correct Answers ✅picture
B
10. Histidine is an amino acid with three titratable groups: an
−NH3+ group (pKa=9.2), a −COOH group (pKa=1.8) and an
imidazole (amine-like) group (pKa=6.0). The pI of histidine is
A) 5.5
B) 7.6
C) 3.9
D) 8.5 - Correct Answers ✅B
(Graded A+)
Exam 1 version A - structure and function
Many types of non-covalent interactions are electrostatic in
nature; one notable exception is
A) Hydrogen bond
C) Ionic interaction
B) Van der Waals interaction
D) Hydrophobic interaction - Correct Answers ✅D
2. Maintaining correct pH is very important for living systems.
Which of the following molecules is
important for pH control in living systems?
A) Proteins, especially those with high content of histidine
residues
B) Dihydrogen phosphate and hydrogen phosphate
C) Bicarbonate
D) All of the above - Correct Answers ✅D
3. While many biochemists use the terms "aspartate" and
"aspartic acid" interchangeably, they do refer to
different things. Which of the following regarding these two
terms is true?
A) Aspartate is the conjugate base of aspartic acid.
,MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
B) Aspartate is converted to aspartic acid upon an increase in
pH.
C) Aspartic acid is converted to aspartate upon a decrease in
pH.
D) All of the above. - Correct Answers ✅A
4. Most likely, the diagram on the right illustrates
A) A hydrogen bond formed between a base-pair
B) A hydrogen bond formed between two adjacent beta-
strands
C) An ionic interaction between two adjacent alpha helices
D) A hydrogen bond formed between two adjacent alpha
helices - Correct Answers ✅picture
B
5. Change in pH can alter the charge status of protein
molecules in aqueous solution. For example, as pH
decreases, protein molecules in aqueous solution tend to
become
A) More protonated and more positively charged
B) Less protonated and more negatively charged
C) More stable and active
D) None of the above - Correct Answers ✅A
,MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
6. Val, Leu, Ile, and Thr are considered as essential amino
acids for humans, meaning we have to get
them from our diet. Structurally, what is a common feature
shared by those four essential amino acids?
A) They all have a polar side chain
B) They all have a non-polar side chain
C) They all have a branched side chain
D) They all have an acidic side chain - Correct Answers ✅C
7. The chemical structure shown on the right is the side chain
of _______________,
which can function as a _________________ in the active site of
an enzyme.
A) Proline; hydrogen bond acceptor
B) Histidine; proton acceptor
C) Tyrosine; hydrogen bond acceptor
D) Histidine; proton donor - Correct Answers ✅picture
B
8. Cystine is formed via
A) Reduction of disulfide bond
B) Oxidation of the side chain of two cysteines
C) Dimerization between a cysteine and a tyrosine
, MCB: Exam Test Bank GUARANTEED PASS
(Graded A+)
D) Dimerization between a cysteine and a methionine -
Correct Answers ✅B
9. Which of the following statements is true regarding the two
amino acids shown on the right?
A) Both can be synthesized using pyruvate as a direct
precursor
B) Both can be synthesized using oxaloacetate as a direct
precursor
C) The one on the left but not the one on the right can be
synthesized using pyruvate as a direct precursor
D) Both are D-aspartate - Correct Answers ✅picture
B
10. Histidine is an amino acid with three titratable groups: an
−NH3+ group (pKa=9.2), a −COOH group (pKa=1.8) and an
imidazole (amine-like) group (pKa=6.0). The pI of histidine is
A) 5.5
B) 7.6
C) 3.9
D) 8.5 - Correct Answers ✅B
