In general, a signal transmitted via a phosphorylation cascade

Question

Quizplus · Accepted Answer

A phosphorylation cascade involves the sequential activation of multiple protein kinases, each adding a phosphate group to the next protein in the cascade. The addition of a phosphate group can cause a conformational change in the protein structure, altering its function or activity. Therefore, choice C is correct.

Answer: A, D
 Choice A is incorrect because a phosphorylase enzyme is not necessarily involved in every phosphorylation cascade. Choice B is incorrect because steroid receptors typically initiate signaling through a different mechanism, such as binding to DNA. Choice C is incorrect because not all proteins in a phosphorylation cascade will necessarily undergo a conformational change. However, choice D is correct because the activity of the cascade can be turned off by a kinase enzyme that removes phosphate groups from the targeted proteins.

In General, a Signal Transmitted Via a Phosphorylation Cascade