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Homework _13 with answers

Homework _13 with answers - B Requires muscle cells to...

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Homework #13, 02/11/09 (Dr. MM-G) 1. Which of the following is true of synaptic signaling and hormone signaling? A. Hormone signaling occurs in short distances only. B. Hormone signaling is important between cells that are at greater distances apart than in synaptic signaling. C. Both use neurotransmitters, but hormone signaling is for adjacent cells in animals only. D. Both are forms of autocrine signaling E. Both are forms of paracrine signaling (Ans B) 2. From the perspective of the cell receiving the message, the three stages of cell signaling are (Ans B) 3. Paracrine Signaling
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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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