試題詳解

29. When a ligand binds a receptor tyrosine kinase, the first step in the signaling cascade is usually:
(A) Conversion of GTP to cGMP.
(B) GTP hydrolysis by the α-subunit of the G protein.
(C) CAMP formation by adenylyl cyclase.
(D) Internalization of the receptor into lysosomes.
(E) Auto-phosphorylation of specific tyrosine residues on the receptor.