Activation of Which of the Following Molecules Generally Requires Protein

Question

Activation of which of the following molecules generally requires protein phosphorylation?
A) receptor tyrosine kinases
B) steroid hormone receptors
C) G protein-coupled receptors
D) ligand-gated ion channels

Accepted Answer

Receptor tyrosine kinases are activated through the phosphorylation of specific tyrosine residues on the receptor itself, typically as a result of ligand binding. This phosphorylation leads to further downstream signaling events.