Bio 140 Exam 4 Key2008 - Bio 140 Exam 4 2008 1. What is the...

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Bio 140 Exam 4 2008 1. What is the approximate composition of the air that we breathe? A. 21% O 2 , 19% argon, 20% N 2 , 20% CO 2 B. 78% N 2 , 21% O 2 , 1% argon, 0.03% CO 2 C. 21% O 2 , 40% argon, 40% N 2 , 0.03% CO 2 D. 78% CO 2, 21% O 2 , 1% argon, , 0.03% N 2 , E. 99% O 2 , 0.1% argon, 0.78% N 2 , 0.3% CO 2 2. Oxidation Reduction reactions (redox) reactions A. involve the transfer of electrons B. involve an electron donor and an electron acceptor C. involve a reducing agent and an oxidizing agent D. all of the above E. A and C only 3. What are the principal products of glycolysis ? A. Coenzyme A, acetate, sucrose D. Glucose, fructose and ATP B. ATP, NADH and FADH 2 E. Pyruvate, ATP and NADH C. glucose, fructose and pyruvate 4. What are the principal end products of the citric acid cycle ? A. CO 2 , NADH, FADH 2, ATP B. citrate, acetate, NADH, FADH 2, ATP C. citrate, Coenzyme A, FADH 2, ATP D. acetate, Coenzyme A, NADH, ATP E. none of the above 5. Why do aerobic life forms (like us) require molecular oxygen (O 2 ) to survive? A. O 2 accepts electrons at the end of the electron transport chain in mitochondria B. O 2 combines with CO 2 to form sugars C. O 2 is required to reduce (not oxidize) sugars and fats in the diet D. O 2 provides the electrons necessary to drive electron transport in mitochondria E. O 2 isn’t required by aerobic life forms 6. The hydrolysis of ATP to ADP and Pi has a G 0 of -7.3 kcal/mole. There is a large enough change in free energy for the hydrolysis of one mole of ATP to be coupled to which of the following endergonic reactions ? A. A B G 0 = - 8 kcal/mole B. F + G H + I G 0 = + 7.5 kcal/mole C. S P G 0 = + 14.6 kcal/mole D. X + Y XY G 0 = -14.6 kcal/mole E. A + B C G 0 = + 6.0 kcal/mole 7. In the figure above, at which stage in cellular respiration does the enzyme phosphofructokinase play a role? A. glycolysis B. pyruvate oxidation C. CAC D. electron transport E. none of the above 8. What is the role of the electron transport chain (ETC) in the redox reactions between NADH and O 2 ? A. to pump protons into the intermembrane space to establish a proton motive force (PMF) B. To establish an electrochemical gradient (a proton gradient) across the membrane C. To accept electrons from NADH so that NAD + can be recycled to pick up additional electrons D. All of the above E. A and C only 9. In cellular respiration most of the electrons sent to the electron transport chain from the breakdown products of glucose are removed from those products during _____________. A. glycolysis D. the citric acid cycle B. fermentation to ethanol E. wrong, electrons are not removed from breakdown C. oxidation of pyruvate to acetyl Co A products of glucose during cellular respiration
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10. In many organisms phosphofructokinase is regulated in which of the following ways? A.
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This note was uploaded on 04/24/2008 for the course BIOLOGY 140 taught by Professor Mullin during the Spring '08 term at University of Tennessee.

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Bio 140 Exam 4 Key2008 - Bio 140 Exam 4 2008 1. What is the...

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