Enzyme Active Site Role in Catalysis

Steps:

• Enzymes speed up reactions by binding substrates at their active site, a specific region shaped for the substrate.
• Damage to the active site alters its shape, preventing proper substrate binding.
• Without binding, the enzyme cannot lower the activation energy for the reaction.
• Thus, the enzyme loses its catalytic function for that specific reaction.

Why B is correct:

• The active site is the enzyme's functional region; per enzyme kinetics, damage disrupts substrate binding and catalysis, halting the specific reaction (Michaelis-Menten model).

Why the others are wrong:

• A: Damage doesn't change the reaction pathway; it prevents the reaction entirely.
• C: Enzymes still diffuse and collide, but binding fails due to shape mismatch.
• D: Damage slows or stops complex formation, not speeds it up.

Final answer: B