Protein Kinases are Enzymes That Normally Catalyze The

Question

Protein kinases are enzymes that normally catalyze the
A)degradation of cellular proteins.
B)phosphorylation of cellular proteins.
C)formation of peptide bonds in proteins.
D)phosphorylation of ADP.
E)synthesis of kinins.

Accepted Answer

Protein kinases catalyze the addition of a phosphate group to specific amino acid residues in cellular proteins, a process known as phosphorylation. This process can activate, deactivate or modify the function of target proteins, and is central to many cellular signaling pathways. Therefore, option B is the correct answer.