Question

which sentence describes the shape of substrates and the active sites of enzymes?
a. they are both concave.
b. they are identical.
c. they are complementary.
d. they are both convex.

Explanation:

Enzymes are biological catalysts. The active site of an enzyme is the region where the substrate binds. According to the lock - and - key model (a basic model for enzyme - substrate interaction), the substrate fits into the active site of the enzyme. This means that the shape of the substrate and the active site of the enzyme are complementary to each other.

Answer:

C. They are complementary.