CHEM 210 BIOCHEMISTRY ADVANCED
COMPREHENSIVE EXAM STUDY GUIDE
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which of the following amino acids contains a side chain that can form a disulfide bond
under oxidizing conditions?
A. Cysteine
B. Methionine
C. Serine
D. Threonine
Answer: A
Conceptual Explanation: Cysteine contains a thiol (-SH) group that can be oxidized to
form a disulfide bridge (-S-S-) with another cysteine residue, which is crucial for protein
tertiary structure.
2. In the Michaelis-Menten equation, what does the constant Km represent regarding the
enzyme’s affinity for its substrate?
A. The concentration of substrate at which the reaction rate is maximal.
B. The rate constant for the formation of the enzyme-substrate complex.
,C. The substrate concentration at which the reaction velocity is half of Vmax.
D. The total concentration of enzyme present in the reaction.
Answer: C
Conceptual Explanation: Km is defined as the substrate concentration at which the
reaction rate is exactly half of the maximum velocity (Vmax). A lower Km indicates higher
affinity.
3. Which metabolic pathway occurs exclusively in the mitochondrial matrix of eukaryotic
cells?
A. The Citric Acid Cycle
B. Fatty acid synthesis
C. Glycolysis
D. Pentose Phosphate Pathway
Answer: A
Conceptual Explanation: While glycolysis and the pentose phosphate pathway occur in
the cytosol, the Citric Acid Cycle (Krebs cycle) takes place in the mitochondrial matrix.
4. A competitive inhibitor affects enzyme kinetics by doing which of the following?
A. Decreasing Vmax and increasing Km.
B. Decreasing Vmax while Km remains unchanged.
C. Increasing Km while Vmax remains unchanged.
, D. Decreasing both Km and Vmax.
Answer: C
Conceptual Explanation: Competitive inhibitors bind to the active site, requiring a higher
substrate concentration to reach half-maximal velocity (increasing Km), but Vmax can still
be reached at high substrate levels.
5. Which of the following is the primary force stabilizing the alpha-helix in proteins?
A. Hydrophobic interactions between non-polar side chains.
B. Hydrogen bonds between the carbonyl oxygen and amide hydrogen of the peptide
backbone.
C. Ionic bonds between oppositely charged R-groups.
D. Covalent disulfide linkages between distant residues.
Answer: B
Conceptual Explanation: The alpha-helix is stabilized by intrachain hydrogen bonds
between the C=O group of one amino acid and the N-H group of the amino acid four
residues ahead.
6. What is the net yield of ATP molecules per molecule of glucose during anaerobic glycolysis
in muscle cells?
A. 4 ATP
B. 36 ATP
COMPREHENSIVE EXAM STUDY GUIDE
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which of the following amino acids contains a side chain that can form a disulfide bond
under oxidizing conditions?
A. Cysteine
B. Methionine
C. Serine
D. Threonine
Answer: A
Conceptual Explanation: Cysteine contains a thiol (-SH) group that can be oxidized to
form a disulfide bridge (-S-S-) with another cysteine residue, which is crucial for protein
tertiary structure.
2. In the Michaelis-Menten equation, what does the constant Km represent regarding the
enzyme’s affinity for its substrate?
A. The concentration of substrate at which the reaction rate is maximal.
B. The rate constant for the formation of the enzyme-substrate complex.
,C. The substrate concentration at which the reaction velocity is half of Vmax.
D. The total concentration of enzyme present in the reaction.
Answer: C
Conceptual Explanation: Km is defined as the substrate concentration at which the
reaction rate is exactly half of the maximum velocity (Vmax). A lower Km indicates higher
affinity.
3. Which metabolic pathway occurs exclusively in the mitochondrial matrix of eukaryotic
cells?
A. The Citric Acid Cycle
B. Fatty acid synthesis
C. Glycolysis
D. Pentose Phosphate Pathway
Answer: A
Conceptual Explanation: While glycolysis and the pentose phosphate pathway occur in
the cytosol, the Citric Acid Cycle (Krebs cycle) takes place in the mitochondrial matrix.
4. A competitive inhibitor affects enzyme kinetics by doing which of the following?
A. Decreasing Vmax and increasing Km.
B. Decreasing Vmax while Km remains unchanged.
C. Increasing Km while Vmax remains unchanged.
, D. Decreasing both Km and Vmax.
Answer: C
Conceptual Explanation: Competitive inhibitors bind to the active site, requiring a higher
substrate concentration to reach half-maximal velocity (increasing Km), but Vmax can still
be reached at high substrate levels.
5. Which of the following is the primary force stabilizing the alpha-helix in proteins?
A. Hydrophobic interactions between non-polar side chains.
B. Hydrogen bonds between the carbonyl oxygen and amide hydrogen of the peptide
backbone.
C. Ionic bonds between oppositely charged R-groups.
D. Covalent disulfide linkages between distant residues.
Answer: B
Conceptual Explanation: The alpha-helix is stabilized by intrachain hydrogen bonds
between the C=O group of one amino acid and the N-H group of the amino acid four
residues ahead.
6. What is the net yield of ATP molecules per molecule of glucose during anaerobic glycolysis
in muscle cells?
A. 4 ATP
B. 36 ATP
