Test_1_Answers

Test_1_Answers - Biology 265 General Physiology Spring 2007...

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Biology 265 General Physiology Spring 2007 Form 0 1. In intertidal mollusks, PEP carboxykinase channels phosphoenol pyruvate into the Krebs cycle. What is the normal pathway from PEP ? a. PEP is converted into succinate b. PEP is converted to pyruvate c. PEP is fermented to lactic acid d. PEP is directly converted to carbon dioxide and water. 2. Under what conditions would PEP carboxykinase be activated ? a. during a rainstorm or periods of low salinity b. when the mollusk was covered by tidal water c. when the mollusk was exposed and above the tide line d. when the temperature fell below normal levels 3. One of the outcomes of the PEP carboxykinase reaction is a. increased metabolic activity of the cells b. fermentation and the formation of lactic acid c. increase in cell osmolarity d. decrease in cell osmolarity 4. LDH of the heart has a much lower affinity for pyruvate than the LDH of muscle. a. True b. false 5. An enzyme a. may change the direction of a reaction b. increases the energy level of the reacting molecules c. increases the proportion of molecules capable of reacting d. increases the energy that is released by the reaction 6. In glycolysis, a. electrons are harvested as NADH b. glucose is converted to carbon dioxide and water c. lactic acid is produced d. all of the above 7. In brown fat, a. more ATP is produced than normal to provide heat b. mitochondria are less numerous so metabolism is slower c. thermogenin allows ATP to cross the inner mitochondrial membrane d. heat rather than ATP is generated
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8. The antifreeze molecule used by Sally Goddard’s winter flounder is a. Trehalose b . protein c. glycoprotein d. glycogen 9. The best thermal insulator (poorest conductor of heat) is a. dry air b. b. goose down c. ice d. d. blubber 10. Which hormone increases metabolic rate in response to a fall in skin temperature ? a.
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Test_1_Answers - Biology 265 General Physiology Spring 2007...

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