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AP Biology Campbell 83 45

AP Biology Campbell 83 45 - Name Class Date ID A 1 Chapter...

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 Chapter 45 Hormones and the Endocrine System Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Which of the following statements about hormones is incorrect? A They are produced by endocrine glands. B They are modified amino acids, peptides, or steroid molecules. C They are carried by the circulatory system. D They are used to communicate between different organisms. E They elicit specific biological responses from target cells. ____ 2. The secretion of hormone A causes a change in the amount of protein X in an organism. If this mechanism works by positive feedback, which of the following statements represents that fact? A An increase in A produces an increase in X. B An increase in X produces a decrease in A. C A decrease in A produces an increase in X. D A and B are correct. E B and C are correct. ____ 3. Which of the following is (are) true? A Hormones regulate cellular functions, and negative feedback regulates hormone levels. B The circulating level of a hormone is held constant through a series of positive feedback loops. C Both lipid-soluble hormones and water-soluble hormones bind to intracellular protein receptors. D Only A and D are true. E A, B, and C are true. ____ 4. What do nitric oxide and epinephrine have in common? A They both function as neurotransmitters. B They both function as hormones. C They are both involved in the "fight-or-flight" response. D Only A and B are correct. E A, B, and C are correct. ____ 5. Substance X is secreted by one cell, travels a short distance through interstitial fluid, and produces an effect in a cell immediately adjacent to the original secreting cell. All of the following terms could describe this substance except A nitric oxide. B neurotransmitter. C prostaglandin. D pheromone. E growth factor. ____ 6. Based on their effects, which pair below could be considered antagonistic? A prostaglandin F and nitric oxide B growth hormone and ecdysone C endocrine and exocrine glands D hormones and target cells E neurosecretory cells and neurotransmitters ____ 7. Which of the following is a local regulator responsible for activating an enzyme that relaxes smooth muscle cells? A nitric oxide B prostaglandin F C epinephrine D A and B only E A, B, and C ____ 8. Prostaglandins are local regulators whose basic structure is derived from A oligosaccharides. B fatty acids. C steroids. D amino acids. E both A and B ____ 9. Which of the following examples is incorrectly paired with its class? A histamine-local regulator B estrogen-steroid hormone C prostaglandin-peptide hormone D ecdysone-steroid hormone E neurotransmitter-local regulator ____ 10. What is the mode of action of aspirin and ibuprofen? A They inhibit the synthesis of prostaglandins. B They inhibit the release of nitric oxide, a potent vasodilator. C They block paracrine signaling pathways. D They stimulate the release of oxytocin.
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