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

Question

Quizplus · Accepted Answer

Receptor tyrosine kinases (RTKs) add phosphate groups to tyrosine residues on target proteins to initiate downstream signaling pathways. If a drug specifically blocks the addition of phosphate groups to proteins, then RTK activity will be inhibited.

Which of the Following Would Be Inhibited by a Drug