Rutgers Introduction to Biochemistry Exam
Prep Test Bank Questions & Guide Exam
Questions and Answers with Explanation
(Latest ): Most Comprehensive to
Pass the Exam, 100% Verified – UPDATED.
Based on search results for CHEM 301 / Murphy 301 at Rutgers University. Due to
copyright restrictions, this is a representative sample of question styles and topics, not
the full 370-question test bank.
,
, CORE DOMAINS COVERED
Amino Acids, Peptides, and Proteins
Enzyme Kinetics and Mechanisms
Bioenergetics and Thermodynamics
Carbohydrate Structure and Metabolism
Lipid Structure and Metabolism
Nucleic Acids and Gene Expression
Signal Transduction Pathways
Metabolic Integration and Regulation
SECTION 1: AMINO ACIDS & PROTEIN STRUCTURE
Question 1
The side chain of histidine has a typical pKa value in the range of 6.5-7.4. However, when
analyzing the pKa values in a particular protein, scientists determined that one particular
His residue has an unusually low pKa value of 4.8. Which of the following statements
correctly explain this anomaly?
A) The microenvironment around a residue can impact its pKa value
B) A positively charged amino acid must be in close proximity to this residue
C) A negatively charged amino acid must be in close proximity to this residue
D) Both A and C
Correct Answer: D) Both A and C
The microenvironment around a residue can significantly impact its pKa value. A
negatively charged amino acid in close proximity would stabilize the protonated form of
histidine, lowering its pKa. A positively charged residue would have the opposite effect,
raising the pKa .
Question 2
Which of the following best describes the biochemical significance of the hydrophobic
effect in protein folding?
, A) It is driven by strong covalent bonds between nonpolar amino acid side chains
B) It maximizes entropy of surrounding water molecules by minimizing ordered cage-
like structures around nonpolar residues
C) It decreases protein stability by forcing hydrophilic residues to the core
D) It depends entirely on hydrogen bond formation between lipid bilayers and protein
backbone
Correct Answer: B
The hydrophobic effect is entropically driven. When nonpolar groups cluster in the protein
interior, surrounding water molecules are released from highly ordered "clathrate" cages,
significantly increasing solvent entropy .
Question 3
Which of the following amino acids has a side chain capable of forming a disulfide bond
with another amino acid residue in a protein?
A) Methionine
B) Cysteine
C) Serine
D) Threonine
Correct Answer: B) Cysteine
Cysteine contains a highly reactive thiol (-SH) group that can oxidize to form disulfide
bridges. Methionine contains a thioether group with a methyl group attached to sulfur,
which prevents it from forming disulfide bonds .
Question 4
Which of the following amino acids contains a sulfur atom in its side chain but is
INCAPABLE of forming covalent disulfide bonds?
A) Cysteine
B) Methionine
C) Threonine
D) Homocysteine
Prep Test Bank Questions & Guide Exam
Questions and Answers with Explanation
(Latest ): Most Comprehensive to
Pass the Exam, 100% Verified – UPDATED.
Based on search results for CHEM 301 / Murphy 301 at Rutgers University. Due to
copyright restrictions, this is a representative sample of question styles and topics, not
the full 370-question test bank.
,
, CORE DOMAINS COVERED
Amino Acids, Peptides, and Proteins
Enzyme Kinetics and Mechanisms
Bioenergetics and Thermodynamics
Carbohydrate Structure and Metabolism
Lipid Structure and Metabolism
Nucleic Acids and Gene Expression
Signal Transduction Pathways
Metabolic Integration and Regulation
SECTION 1: AMINO ACIDS & PROTEIN STRUCTURE
Question 1
The side chain of histidine has a typical pKa value in the range of 6.5-7.4. However, when
analyzing the pKa values in a particular protein, scientists determined that one particular
His residue has an unusually low pKa value of 4.8. Which of the following statements
correctly explain this anomaly?
A) The microenvironment around a residue can impact its pKa value
B) A positively charged amino acid must be in close proximity to this residue
C) A negatively charged amino acid must be in close proximity to this residue
D) Both A and C
Correct Answer: D) Both A and C
The microenvironment around a residue can significantly impact its pKa value. A
negatively charged amino acid in close proximity would stabilize the protonated form of
histidine, lowering its pKa. A positively charged residue would have the opposite effect,
raising the pKa .
Question 2
Which of the following best describes the biochemical significance of the hydrophobic
effect in protein folding?
, A) It is driven by strong covalent bonds between nonpolar amino acid side chains
B) It maximizes entropy of surrounding water molecules by minimizing ordered cage-
like structures around nonpolar residues
C) It decreases protein stability by forcing hydrophilic residues to the core
D) It depends entirely on hydrogen bond formation between lipid bilayers and protein
backbone
Correct Answer: B
The hydrophobic effect is entropically driven. When nonpolar groups cluster in the protein
interior, surrounding water molecules are released from highly ordered "clathrate" cages,
significantly increasing solvent entropy .
Question 3
Which of the following amino acids has a side chain capable of forming a disulfide bond
with another amino acid residue in a protein?
A) Methionine
B) Cysteine
C) Serine
D) Threonine
Correct Answer: B) Cysteine
Cysteine contains a highly reactive thiol (-SH) group that can oxidize to form disulfide
bridges. Methionine contains a thioether group with a methyl group attached to sulfur,
which prevents it from forming disulfide bonds .
Question 4
Which of the following amino acids contains a sulfur atom in its side chain but is
INCAPABLE of forming covalent disulfide bonds?
A) Cysteine
B) Methionine
C) Threonine
D) Homocysteine
