Question

In the lock-and-key model of enzyme action, the ___________ fits into the __________ of the enzyme.

A) product; substrate.
B) active site; product.
C) substrate; active site.
D) active site; substrate.

Answer 1

C) Substrate; active site

Answer 2

In the lock-and-key model of enzyme action, the ___ substrate________ fits into the __active site________ of the enzyme.
This model was proposed by the Emil Fischer in 1894 and proposed that enzymes have different shape and proposed lock and key model
so i conclude option C is correct
hope it helps