The primary regulatory step from pyruvate through the citric acid cycle is: A. i

Question

The primary regulatory step from pyruvate through the citric acid cycle is: A. isocitrate dehydrogenase B. a-ketoglutarate dehydrogenase C. pyruvate dehydrogenase complex D. citrate synthase E. succinate thiokinase (also known as: succinyl CoA synthetase) How many ATP are produced by aerobic cellular respiration of each glucose molecule? A. Two B. Four C. Five D. Fifteen E. Thirty How many NADH are produced from pyruvate through the citric acid cycle for each molecule of glucose? A. Two B. Three C. Four D. Six E. Eight Which of the following protein complexes do NOT pump protons? A. NADH Q-oxidoreductase (Complex I) B. Succinate Q reductase (Complex III) C. Q cytochrome C oxidoreductase (Complex III) D. Cytochrome C oxidase (Complex IV) Electrons are carried from Q cytochrome C oxidoreductase (Complex III) to Cytochrome C oxidase (Complex IB) by: A. Coenzyme Q B. NADH C. Cytochrome C D. FADH2 In general body cells, the electrons from NADH produced in glycolysis are brought into the mitochondria: A. through the malate-aspartate shuttle B. by the simple diffusion of NADH through the inner membrane to the matrix. C. through the glycerol 3-phosphate shuttle. D. though ATP synthase. E. through an NADH transporter. Glucose 6 phosphatase. A. is stimulated by insulin B. produces fructose 6-phosphate C. is not a regulatory enzyme. D. is found only in the liver. E. phosphorylates glucose. Pyruvate dehydrogenase complex: A. is activated by phosphorylation. B. is activated by the presence of ATP. C. is activated by the presence of NADH. D. is inhibited by the presence of ADP. E. is activated by the presence of pyruvate.

Explanation / Answer

18. Answer is A

Both A and B are regulatory steps but primary is A

19. Answer is E

Generally 38 ATP molecules are produced per glucose molecule but during ATP expenditure only 30 ATP are produced per glucose molecule

21. Answer is B

Complex 2 cannot pump protons

23. Answer is C

Generally both shuttles are used but for glycolysis answer is C

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