6) A G-protein receptor with GTP bound to it A) is in its active state
B) signals a protein to maintain its shape and conformation
C) will use cGMP as a second messenger
D) directly affects gene expression
7) Testosterone functions inside a cell by
A) acting as a signal receptor that activates tyrosine kinases
B) binding with a receptor protein that enters the nucleus and activates specific genes
C) acting as a steroid signal receptor that activates ion channel proteins
D) coordinating a phosphorylation cascade that increases spermatogenesis