Chapter 22.5, Problem 22.5QC

Match the description of the enzyme process with its type of regulation.

(a) The product of a series of 10 reactions inhibits the third reaction in the series.

(b) An enzyme is produced in an inactive form that becomes active only after several amino acids are removed.

(c) A small molecule binds to enzyme $\text{A}$ at a site other than the active site. When this molecule is bound, the activity of the enzyme doubles.

(d) There are two forms of an enzyme. One is more active than the other. The most active form becomes less active when a particular amino acid on its surface is methylated.

(e) An enzyme is made up of four subunits. There are two types of subunits with slightly different isoelectric points, and different permutations are found in different tissues of the body.

1. Covalent modification

2. Isozymes

3. Allosterism

4. Feedback Inhibition

5. Zymogens