Question

how does phosphorylation control protein activity?
choose one:
○ a. the phosphate group, with its positive charges, temporarily relieves feedback inhibition.
○ b. the phosphate group, with its negative charges, prevents other negatively charged molecules from interacting with the protein.
○ c. the phosphate group alters the primary structure of the protein.
○ d. the phosphate group induces a change in the proteins conformation.
○ e. the phosphate group serves as an added source of energy for a protein.

Explanation:

Phosphorylation involves the addition of a phosphate group to a protein. This addition causes a conformational change in the protein, which can either activate or inactivate it. The phosphate group is negatively - charged but its main effect is on protein shape, not on preventing interactions with other negative molecules or altering primary structure, and it doesn't relieve feedback inhibition by its charge nor serve as an energy source in this context.

Answer:

D. The phosphate group induces a change in the protein's conformation.