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1 vote
Most signal molecules ('primary messenger'):

A. Diffuse through the membrane and bind to a receptor in the cytoplasm
B. Bind to the membrane receptors and transmit information across a membrane without traveling the membrane
C. Enter the cell via receptor-mediated endocytosis
D. A and C
E. A, B, and C

User Lunette
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1 Answer

2 votes
Answer and Explanation: The correct answer is B. The majority of the primary messengers are ligands that bind to cell-surface (membrane) receptors. Such ligands are unable to penetrate through the cell membrane due to their polar or hydrophilic structure
User XGamerX
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