A G protein is
A) a type of water-soluble hormone.
B) a second messenger activated by a steroid hormone.
C) a molecule that binds a guanine nucleotide and helps transduce a signal inside a target cell.
D) a receptor for a water-soluble hormone that causes arachidonic acid to be extracted from a phospholipid.
E) an enzyme that catalyzes the conversion of ATP into cyclic AMP.

Question

Quizplus · Accepted Answer

G proteins are molecular switches that bind guanine nucleotides (GDP and GTP) and play a crucial role in transmitting signals from cell surface receptors to internal signaling pathways.

A G Protein Is