Posted Exam 4 2007

Posted Exam 4 2007 - BISC 220L, Fourth Exam Spring 2007 1....

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Posted Exam 4 2007 Page 1 of 4 BISC 220L, Fourth Exam Spring 2007 1. In which one of the following ways are testosterone and thyroid hormone similar? a. Both hormones stimulate catabolism, or breakdown, of cellular proteins. b. The immediate effect of both hormones is a rise in intracellular cAMP. c. Both hormones bind to G protein-coupled receptors. d. Both hormones are released from secreting cells by exocytosis. e. Receptors for both hormones are located in the cytoplasm or nucleus. 2. The posterior pituitary hormone involved in milk letdown and childbirth in women is ____________________________. A possible function of this hormone in men is ______________________________________________________. 3. A female student visits the student health center because she has been gaining weight, feels cold all the time, and lacks energy. Upon physical examination, her body temperature, heart rate, and blood pressure were all below normal. The doctor ordered blood tests for plasma levels of thyroid hormone and thyroid stimulating hormone. What would you expect the results of those tests to be? Briefly explain why you would expect those results. 4. Indicate whether each of the following statements is true or false by writing the word “True” or “False” in the blank (do not mark with T or F) . ________ a. A patient with Graves’ disease is likely to show symptoms of hyperthyroidism. ________ b. Administration of dexamethasone, a synthetic glucocorticoid, would likely cause an increase in secretion of corticotropin releasing hormone. ________ c. Suffering a painful leg fracture is likely to cause an increase in secretion of ACTH. ________ d. A rise in the plasma concentration of Ca 2+ ions is likely to stimulate an increase in secretion of parathyroid hormone. 5. Provide a brief, mechanistic explanation for the following symptoms of uncontrolled diabetes mellitus: a) acidosis, b) widespread osmotic damage to cells, c) appearance of glucose in the urine. 6. Living organisms must have successful strategies for reproduction. Although all animals reproduce sexually, some use asexual reproduction most of the time. List the strategic advantages and disadvantages of asexual and sexual reproduction. 7. In what ways are the penis and clitoris similar? 8. There has long been interest in developing a male contraceptive treatment that would be functionally equivalent to birth control pills taken by women. Such a treatment must be highly effective in stopping the development of viable sperm, but have minimal or no side effects. Some of the drugs currently being tested for this purpose are blockers of GnRH receptors. Explain how a
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This note was uploaded on 06/23/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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Posted Exam 4 2007 - BISC 220L, Fourth Exam Spring 2007 1....

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