What is the difference between Ras and the G proteins bound to G protein-coupled receptors (GPCRs)?
A. Ras is a second messenger, and the G proteins bound to GPCRs are not second messengers.
B. Ras is an enzyme, and the G proteins bound to GPCRs are not enzymes.
C. Ras can activate different effector molecules, and the G proteins bound to GPCRs cannot activate different effector molecules.
D. Ras is a small G protein, and the G proteins bound to GPCRs are not small G proteins.
Answer: D
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