Answers_to_practice_questions_Ch16 - Answers to the Ch16...

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Answers to the Ch16 practice questions 1. endocrine, contact-dependent, paracrine, neuronal, receptor 2. 3 paracrine signaling 1 contact-dependent signaling 2 neuronal signaling 4 endocrine signaling 3. A. changes in cell secretion B. changes in protein phosphorylation C. changes in membrane potential 4. A. An answer involving the modification of existing cell components is correct. For example, protein phosphorylation, protein dephosphorylation, protein ubiquitylation, lipid phosphorylation, and lipid cleavage are correct answers. B. Alterations in gene expression occur slowly. C. Modification of existing cellular components can be achieved quickly, whereas responses requiring changes in gene expression take much longer, because the genes will need to be transcribed, the mRNAs will need to be translated, and the proteins should accumulate. 5. d 6. d 7. c 8. b 9. c 10. receptors, effector, amplify, integrate, GTP-binding, protein kinases, protein phosphatases 11. Ion-channel-coupled receptors; G-protein-coupled receptors; enzyme-coupled receptors. 12. a 13. seven, three, Two, GDP, GTP, GTPase, chlera toxin 14. A. No. Each signaling molecule activates only one receptor molecule. B. Yes. Each activated GPCR stimulate many G-protein molecules.
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This note was uploaded on 11/21/2011 for the course PCB 3134 taught by Professor Multiple during the Fall '08 term at University of Florida.

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Answers_to_practice_questions_Ch16 - Answers to the Ch16...

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