Biochemistry
Metabolic pathways, enzymes, proteins
Showing 131–133 of 133 questions
Which type of enzyme inhibition is characterized by a competitive interaction with the active site?
Correct Answer:
D. Competitive inhibition
EXPLANATION
In competitive inhibition, the inhibitor competes with substrate for the active site and can be overcome by increasing substrate concentration.
The Michaelis-Menten equation describes enzyme kinetics. What does Km represent?
Correct Answer:
B. Substrate concentration at half maximal velocity
EXPLANATION
Km (Michaelis constant) represents the substrate concentration at which enzyme velocity is half of Vmax, indicating substrate affinity.
Enzyme cofactors are non-protein substances that are essential for enzyme activity. Which of the following is NOT a cofactor?
Correct Answer:
D. Serine
EXPLANATION
Serine is an amino acid, not a cofactor. Cofactors include metal ions and coenzymes like NAD⁺, FAD, and CoA.