A protein kinase is an enzyme that functions in which of the following ways?
A) by serving as a second messenger molecule
B) by serving as a receptor for various signal molecules
C) by adding a phosphate group to activate or inactivate other proteins
D) by activating a G protein

Question

Quizplus · Accepted Answer

Protein kinases function by transferring a phosphate group from ATP to specific amino acids on target proteins. This phosphorylation can activate or inactivate the target proteins, thereby playing a crucial role in signaling pathways and cellular processes.

A Protein Kinase Is an Enzyme That Functions in Which