Posted_Final_2005_9am

Posted_Final_2005_9am - Herrera Questions 9am BISC 220...

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Herrera Questions 9am BISC 220 Final, Spring 2005 A1. Which one of the following is a form of sexual reproduction? a. hermaphroditism d. parthenogenesis b. fragmentation e. fission c. budding A2. Which of the following produce(s) testosterone? Write only one letter in the box. a. spermatozoa k. b & c b. hypothalamus l. c, g & j c. Sertoli cells m. d, g & h d. Thecal cells n. c, d & i e. anterior pituitary o. f & g f. seminiferous tubules p. c, f & j g. Leydig cells h. adrenal cortex i. adrenal medulla j. granulosa cell A3. Kallman’s syndrome is a disorder in which GnRH-releasing neurons do not migrate to the hypothalamus and develop normally. Which one of the following would not be expected in a patient with untreated Kallman’s syndrome? a. infertility b. low desire for sex c. high sperm counts in men d. rare and irregular ovulatory cycles in women e. feminization of male secondary sex characteristics A4. If you were a scientist trying to develop a male contraceptive drug that acted on the anterior pituitary, would you try to block the secretion of FSH or LH? Briefly explain the reason for your choice and why you would not choose the other hormone. A5. Which one of the following structures is shared by the excretory and reproductive systems in males? a. testes d. vas deferens b. ureter e. prostate c. urethra A6. If you increased the internal concentration of K + in a typical neuron, what immediate effect would this have on the resting membrane potential (Vm)? a. Vm would depolarize. b. Vm would hyperpolarize. c. Vm would not change. d. Vm would approach 0 mV. Posted Final_2005_9am Page 1 of 7
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A7. If extracellular [Cl - ] was 120 mM, intracellular [Cl - ] was 12 mM, and the membrane was only permeable to Cl - ions, which one of the following would be a likely membrane potential for such a cell? a. +50 mV b. 0 mV c. -60 mV d. Insufficient information is provided to answer this question. A8. A newly formed human zygote has a sufficient supply of energy to survive for about 1 day on its own. However, the delay between fertilization and implantation of the blastocyst can be as long as 8 days. What mechanisms sustain the zygote for such a long time? Your answer should include all anatomical structures and hormones that are directly involved. A9. Tetrodotoxin, which is produced by puffer fish, specifically binds to voltage-gated Na + channels in nerve membranes and prevents the channels from opening. Which one of the following is likely to occur in a person poisoned with tetrodotoxin? a. Nerve cells would be depolarized. b. Nerve cells would be hyperpolarized. c. Spontaneous action potentials would be generated in nerve cells. d. The duration of action potentials in nerve cells would be prolonged. e. The person would die by asphyxiation.
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This note was uploaded on 03/22/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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Posted_Final_2005_9am - Herrera Questions 9am BISC 220...

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