6. In the citric acid cycle, acetyl-CoA reacts with ______ to produce______
(A)fumarate； a-ketoglutarate
(B) oxaloacetate； citrate
(C) citrate； isocitrate
(D) succinyl-CoA； oxaloacetate

12. In the citric acid cycle, acetyl-CoA reacts with_________to produce______. (A) fumarate; -kctoglutarate (B) oxaloacetate; citrate (C) citrate; isocitrate (D) succinyl-CoA; oxaloacetate (E) malate; cis-aconitate

18. In the citric acid cycle, acetyl-CoA reacts with ________ to produce _________.(A) fumarate; α-ketoglutarate(B) oxaloacetate; citrate(C) citrate; isocitrate(D) succinyl-CoA; oxaloacetate(E) malate; cis-aconitate

18) In the citric acid cycle, acetyl-CoA reacts with ________ to produce _________.(A) fumarate; α-ketoglutarate(B) oxaloacetate; citrate(C) citrate; isocitrate(D) succinyl-CoA; oxaloacetate(E) malate; cis-aconitate

7. Which of the following reactions is commonly used to replenish intermediates of the citric acid cycle? (A) citrate→ oxaloacetate + acetyl CoA (B) oxaloacetate→＞ aspartate (C) glutamate →＞ a-ketoglutarate (D) malate ＞ pyruvate

8. What is the source of acetyl-CoA for the glyoxylate cycle? (A) fatty acids (B) pyruvate (C) amino acids (D) cholesterol

9. During exercise, which of the following is not likely to happen in muscle cells? (A) LDH (lactate dehydrogenase) is increased and lactate fermentation takes place (B) IDH (Isocitrate dehydrogenase) is activated by ADP and TCA cycle increases (C) PDH (Pyruvate dehydrogenase) phosphatase is activated by Ca't and TCA cycle increases (D) PDH (Pyruvate dehydrogenase) kinase is activated by ATP and TCA cycle increases

10. In the electron transport chain of mammalian cells, what is the electron donor generated from TCA cycle, and the final electron acceptor? (A) NADPH, Pyruvate (B) NADPH, O2 (C) NADH, O2 (D) FADH2, Cytochrome C

11. In pH 7.0, A is a nonpolar amino acid. B is a positive-charged amino acid. C is a negative-charged amino acids. What's A, B and C? (A) A: Leu, B: Arg, C: Asp (B) A: Ala, B: Tyr, C: Thr (C) A: Ser, B: Thr, C: Glu (D) A: Cys, B: Lys, C: Gln

12. Some enzymes may participate in glycolysis pathway and gluconeogenesis pathway. Which one is only participate in glycolysis pathway? (A) Hexokinase (B) Phosphoglucose isomerase (C) Aldolase (D) Phosphoglycerate mutase

13. Which one is carbohydrate with the lowest molecular weight? (A) Cellulose (B) Glyceraldehyde (C) Glucose (D) Xylose

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