Exam+2+--+Winter+2007+--+ANSWERS+_do+not+distribute_

Exam+2+--+Winter+2007+--+ANSWERS+_do+not+distribute_ -...

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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 1 of 9 Exam Instructions: This exam has 2 parts. Put your name and UM ID number on every page of this exam. The exam will be separated for grading, and if your name and ID is not on a page you will not receive credit for that page! Part 1: Short answer. Write answers to short answer/essay questions in the space provided. Most questions should require only one to three sentences. Be concise but make sure enough information is provided to answer the question. These questions are worth 50 points out of 100, so you should spend approximately half of your time answering them. Write legibly! Part 2: Multiple choice. Questions are to be answered on the scantron sheet. There is only one correct answer for each question. On the scantron please write and bubble in your name and UM ID number. These questions are worth 50 points out of 100, so you should spend approximately half of your time answering them.
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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 2 of 9 Part 1: Short answer. Write answers to short answer/essay questions in the space provided. The exam will be separated for grading, and if your name and ID is not on a page you will not receive credit for that page! Q1. Ion channels at the tips of the hair cells in the cochlea open in response to movement in one direction. The membrane of the hair cells becomes depolarized by K+ movement rather than Na+ movement. Which way does the K+ move and can you predict a reason for this? Hint: The extracellular fluid around a hair cell is not like the extracellular fluid elsewhere in the body! 3 points - K+ will move into the cells - because the concentration of K+ is higher in the extracellular fluid than within the cell (cytosol) Q2. A person is receiving very large doses of cortisol to suppress her immune system. a. What happens to her secretion of cortisol in response to taking exogenous cortisol? Explain your answer naming specific hormones that may apply. 3 points - her cortisol secretion will decrease - because exogenous cortisol will negatively feedback to decrease CRH and ACTH b. Explain how cortisol treatment may exacerbate symptoms of Diabetes mellitus 2 points - Cortisol will stimulate increased blood glucose - blood glucose levels will be even greater than with Diabetes mellitus alone Q3. If you were a scientist trying to develop a male contraceptive acting on the anterior pituitary, would you try to block the secretion of FSH or LH? Explain the reason for your choice. 4 points - I would try to block FSH secretion - sterility would result by block of either FSH or LH - however loss of LH would also cause undesirable elimination of testosterone (no major side effects of FSH block)
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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 3 of 9 Q4. Many taste receptors work by inactivating resting K+ leak channels. Explain why
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