Question

what do the enzymes that are activated by the binding of calmodulin and calcium do?
o a. harden and stabilize the teeth
o b. aid in the secretion of hormones
o c. regulate the transmission of nerve impulses
o d. break down glycogen to release energy for muscle contraction

Explanation:

Calmodulin - activated enzymes in muscle cells are involved in glycogen breakdown to release energy (like glycogen phosphorylase activation) for muscle contraction. Option a is about teeth (not related to calmodulin - enzyme action), option b is about hormone secretion (calmodulin's role here is not main for this option's description), option c: calmodulin's role in nerve impulse transmission is less direct in this context compared to muscle energy release. So the correct function is breaking down glycogen for muscle contraction energy.

Answer:

d. Break down glycogen to release energy for muscle contraction