Answer: Active site.
- A Allosteric site
- B Active site
- C Binding domain
- D Catalytic cleft
Correct answer: B. Active site
Explanation: The active site is the specific region of an enzyme where substrate binds and the reaction occurs. It has a complementary shape to the substrate.
As substrate concentration rises, reaction rate increases steeply at first, then plateaus at Vmax once every enzyme molecule is working at full capacity; Km is the substrate concentration giving half-maximal rate, and a LOWER Km means the enzyme reaches that rate with less substrate (higher affinity).
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.