This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
G-proteins act as: 
Select and explain. 
A. Hormone carriers, B. Hormone receptors, C. Second messengers, D. Signal transducers
D: Signal transducers
Answer: D: Signal transducers 
Explanation: Ans. D. Signal transducersG- proteins are signal transducers. Signaling event is terminated when the hormone is removed and the a-subunit inactivates itself by converting its bound GTP to GDP.