The lock and key model of enzyme activity proposes that each __________.
A) enzyme can react with only a single substrate
B) enzyme has a cofactor that promotes the catalytic activity
C) substrate has a specific cofactor that binds it to the enzyme
D) enzyme binds a specific substrate because the active site and substrate have complementary structures.
E) Both A and B are correct.

Question

Quizplus · Accepted Answer

The lock and key model suggests that enzymes and substrates fit together with specificity, much like a lock and its key, due to the complementary shapes of the active site and the substrate. This model does not imply that enzymes can only react with a single substrate in all contexts (as some enzymes can act on multiple substrates), nor does it focus on cofactors in its basic premise.

The Lock and Key Model of Enzyme Activity Proposes That