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Unformatted text preview: B. Requires muscle cells to release a neurotransmitter into synapse. C. Occurs only in the same cell. D. Involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid. E. Involves factors attaching to target cells and causing production of new paracrine cells (Ans = D) 4. A protein in the plasma membrane that recognizes a molecular signal is most similar to A. DNA encoding a message that is transcribed into RNA B. A molecule that relays a signal C. A receptor with an optimum pH and temperature for activity D. A molecule that produces a cellular response E. A specific catalytic site of an enzyme binding to a substrate. (Ans E) 5. A small molecule that specifically binds to a larger molecule. A. Is called signal transducer. B. Is a ligand. C. Is a receptor D. Sometimes is involved in hormone signaling E. B & D are true (Ans E)...
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- Spring '08