MURPHY 301 EXAM INTRO TO
BIOCHEMISTRY| 2025 COMPREHENSIVE
EXAM WITH CORRECT VERIFIED
ANSWERS. A+ GRADED. GUARANTEED
EXAM EXCELLENCE
Choose the amino acid that *does NOT* function as a
neurotransmitter.
A. Glutamic acid
B. Glycine
C. Tyrosine
D. Lysine
E. Cysteine - ✔ ANSWER ✔ Glycine -- it doesn't have an R
group so it can't interact with anything
The three-dimensional structure of a protein is determined
primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding
framework.
D. modification during interactions with ribosomes
,E. the sequence of amino acids in the protein - ✔ ANSWER
✔ E. the sequence of amino acids in the protein
Determine the net charge of the following tetrapeptide at pH
3 that contains the amino acids represented by the single
letters "KYLE", such that K is at the amino-terminal end of
the peptide and E is at the carboy-terminal end.
A. +2
B. +1
C. 0
D. -1
E. -2 - ✔ ANSWER ✔ +1
What is the isoelectric point of the following tetrapetide that
contains the amino acids represented by the single letters
"DREN", such that D is at the amino-terminal end of the
peptide and N is at the carboy-terminal end.
A. 3.86
B. 4.06
C. 6.53
D. 8.8
E. 12.48 - ✔ ANSWER ✔ 4.06
,The three-dimensional structure of a protein is determined
primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding
framework.
D. modification during interactions with ribosomes
E. the sequence of amino acids in the protein - ✔
ANSWER ✔ the sequence of amino acids in the protein
The enzyme fumarase catalyzes the reversible hydration of
fumaric acid to l-malate, but it will not catalyze the hydration
of maleic acid, the cis isomer of fumaric acid. This is an
example of:
A. biological activity.
B. chiral activity.
C. racemization.
D. stereoisomerization.
E. stereospecificity. - ✔ ANSWER ✔ stereospecificity
If the free energy change ΔG for a reaction is -46.11 kJ/mol,
the reaction is:
A. at equilibrium.
B. endergonic.
C. endothermic.
, D. exergonic.
E. exothermic. - ✔ ANSWER ✔ exergonic
Which of the following amino acids contain a hydrophobic
side chain
A. Leucine
B. Arginine
C. Glutamine
D. Glutamic acid
E. Aspartic acid - ✔ ANSWER ✔ Leucine
Local folding of a protein occurs at what defined level of
protein folding?
A. Primary
B. Secondary
C. Tertiary
D. Quarternary
E. All of the above - ✔ ANSWER ✔ Secondary
Biological machines are derived from which class of
compounds
A. Fats
B. Proteins
C. Carbohydrates
BIOCHEMISTRY| 2025 COMPREHENSIVE
EXAM WITH CORRECT VERIFIED
ANSWERS. A+ GRADED. GUARANTEED
EXAM EXCELLENCE
Choose the amino acid that *does NOT* function as a
neurotransmitter.
A. Glutamic acid
B. Glycine
C. Tyrosine
D. Lysine
E. Cysteine - ✔ ANSWER ✔ Glycine -- it doesn't have an R
group so it can't interact with anything
The three-dimensional structure of a protein is determined
primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding
framework.
D. modification during interactions with ribosomes
,E. the sequence of amino acids in the protein - ✔ ANSWER
✔ E. the sequence of amino acids in the protein
Determine the net charge of the following tetrapeptide at pH
3 that contains the amino acids represented by the single
letters "KYLE", such that K is at the amino-terminal end of
the peptide and E is at the carboy-terminal end.
A. +2
B. +1
C. 0
D. -1
E. -2 - ✔ ANSWER ✔ +1
What is the isoelectric point of the following tetrapetide that
contains the amino acids represented by the single letters
"DREN", such that D is at the amino-terminal end of the
peptide and N is at the carboy-terminal end.
A. 3.86
B. 4.06
C. 6.53
D. 8.8
E. 12.48 - ✔ ANSWER ✔ 4.06
,The three-dimensional structure of a protein is determined
primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding
framework.
D. modification during interactions with ribosomes
E. the sequence of amino acids in the protein - ✔
ANSWER ✔ the sequence of amino acids in the protein
The enzyme fumarase catalyzes the reversible hydration of
fumaric acid to l-malate, but it will not catalyze the hydration
of maleic acid, the cis isomer of fumaric acid. This is an
example of:
A. biological activity.
B. chiral activity.
C. racemization.
D. stereoisomerization.
E. stereospecificity. - ✔ ANSWER ✔ stereospecificity
If the free energy change ΔG for a reaction is -46.11 kJ/mol,
the reaction is:
A. at equilibrium.
B. endergonic.
C. endothermic.
, D. exergonic.
E. exothermic. - ✔ ANSWER ✔ exergonic
Which of the following amino acids contain a hydrophobic
side chain
A. Leucine
B. Arginine
C. Glutamine
D. Glutamic acid
E. Aspartic acid - ✔ ANSWER ✔ Leucine
Local folding of a protein occurs at what defined level of
protein folding?
A. Primary
B. Secondary
C. Tertiary
D. Quarternary
E. All of the above - ✔ ANSWER ✔ Secondary
Biological machines are derived from which class of
compounds
A. Fats
B. Proteins
C. Carbohydrates
