The lock-and-key theory described the action of
A)enzymes as keys that fit different chemicals.
B)substrates as keys that fit different enzymes.
C)enzymes as locks that fit other enzymes.
D)substrates as locks that fit different enzymes.

Question

Quizplus · Accepted Answer

The lock-and-key theory describes the action of enzymes as being like a lock with a specific shape (the active site) that only certain substrates (keys) can fit into. Therefore, the correct choice is B)substrates as keys that fit different enzymes.

The Lock-And-Key Theory Described the Action of