Exam+2+--+Fall+2006+--+ANSWERS+_do+not+distribute_ - Bio...

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Bio 225 Exam 2 Fall 2006 Biology 225 Principles of Animal Physiology Name___Answer Key______ Exam 2 (100 pts) Fall 2006 (Denver) ID#__________________________ Thirty one questions total; Two sections (Part I – pp. 1-7; Part II – pp. 8-13) Part I. Multiple Choice (total 60 points). Each question is worth 2.5 points. Answer all of the questions. Multiple choice questions have only one answer. 1.) Active transport usually moves molecules a) toward higher pH. b) in a direction that brings about equilibrium. c) in the same direction as does diffusion. d) in the opposite direction as does diffusion. e) toward higher osmotic potential. 2.) Which of the following pituitary hormones are comprised of subunits derived from two different genes? a. Luteinizing hormone. b. Growth hormone c. Prolactin d. Thyroid stimulating hormone e. a and d. (LH and TSH are glycoprotein hormones comprised of subunits) 3.) The neuropeptides oxytocin and anti-diuretic hormone (ADH) are released from the vertebrate neurohypophysis into the systemic blood circulation. ADH is secreted in greater amounts during acute blood loss (i.e., hemorrhage). Which of the following do you think is an important physiological action of ADH during hemorrhage? a. ADH acts on the kidney to cause increased urine production, thus increasing blood pressure. b. ADH acts on the kidney to cause decreased urine production, thus increasing blood pressure. c. ADH acts on blood vessels to cause vasoconstriction, thus decreasing blood loss. d. ADH acts on blood vessels to cause vasodilation, thus decreasing blood loss. e. b and c. (ADH – also known as AVP – has antidiuretic and pressor effects.) 4.) Insulin, which is secreted by the beta cell located in the pancreatic Islets of Langherhans immediately after a meal causes: a. an increased rate of glucose transport into the target cell. b. decreased conversion of glucose to glycogen in liver and skeletal muscle. c. a decreased rate of glucose utilization and ATP generation. d. all of the above. e. a and c 1
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Bio 225 Exam 2 Fall 2006 5.) Approximately 90% of cases of diabetes mellitus are type 2. Which of the following best describes the cellular defect found in most cases of type 2 diabetes? a. The pancreatic beta cells stop producing insulin. b. The pancreatic alpha cells stop producing glucagon. c. Cells of the body (e.g., liver) become resistant to insulin action. (This is the hallmark of type 2 diabetes. The hallmark of type 1 is the beta cells stop producing insulin) d. Cells of the body (e.g., liver) become resistant to glucagon action. e. a and c. 6.) Which of the following hormones would you expect to be elevated in the blood plasma during fasting? a) leptin b) estrogen c) insulin d) prolactin e) cortisol (glucocorticoids mobilize stored fuels and stimulate gluconeogenesis) 7.) During the fight-or-flight response the adrenal medulla is rapidly activated. Which of the following statements regarding the adrenal medulla is correct?
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This note was uploaded on 07/11/2011 for the course BIOLOGY 225 taught by Professor Pavgi during the Spring '10 term at University of Michigan.

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Exam+2+--+Fall+2006+--+ANSWERS+_do+not+distribute_ - Bio...

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