Most signal molecules:
A) easily diffuse through the membrane and bind to a receptor in the cytoplasm.
B) bind to membrane receptors and transmit information across a membrane without traversing the membrane.
C) carry out functions in the nucleus after binding to a receptor in the cell membrane.
D) A and C.
E) A, B, and C.

Question

Quizplus · Accepted Answer

Most signal molecules bind to membrane receptors and transmit information across a membrane without traversing the membrane. This allows for a more controlled response to the signal, as the signal molecule must bind to the specific receptor on the cell surface before it can be transmitted across the membrane. Some signal molecules may also bind to receptors within the cytoplasm or nucleus, but this is less common.

Most Signal Molecules