Which of the following activities would be inhibited by a drug that specifically blocks the addition of phosphate groups to proteins?
A) binding of G proteins to G protein-coupled receptors
B) ligand-gated ion channel signalling pathways
C) adenylyl cyclase activity
D) receptor tyrosine kinase activity

Question

Quizplus · Accepted Answer

Receptor tyrosine kinases are activated by phosphorylation, and if the addition of phosphate groups is blocked, their activity would be inhibited. The other options are not dependent on phosphorylation for their function.

Which of the Following Activities Would Be Inhibited by a Drug