Glycolysis problems
- 1. Which of the following regulates glycolysis steps?
Options- A. Phosphofructokinase
- B. Hexose kinase
- C. Pyruvate kinase
- D. All of these Discuss
Correct Answer: All of these
- 2. Which of the following is not true of glycolysis?
Options- A. ADP is phosphorylated to ATP via substrate level phosphorylation
- B. The pathway does not require oxygen
- C. The pathway oxidizes two moles of NADH to NAD+ for each mole of glucose that enters
- D. The pathway requires two moles of ATP to get started catabo-lizing each mole of glucose Discuss
Correct Answer: The pathway oxidizes two moles of NADH to NAD+ for each mole of glucose that enters
- 3. During catabolism, only about 40% of the energy available from oxidizing glucose is used to synthesize ATP. Remaining 60%
Options- A. is lost as heat
- B. is used to reduce NADP
- C. remains in the products of metabolism
- D. is stored as fat. Discuss
Correct Answer: is lost as heat
- 4. For every one molecule of sugar glucose which is oxidized __________ molecule of pyruvic acid are produced.
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 2
- 5. The amount of energy received from one ATP is
Options- A. 76 kcal
- B. 7.3 kcal
- C. 760 kcal
- D. 1000 kcal Discuss
Correct Answer: 7.3 kcal
- 6. Fructose-2,6-bisphosphate
Options- A. activates fructose-1,6-bisphosphatase
- B. activates phosphofructokinase
- C. inhibits fructose-1,6-bisphosphatase
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 7. The active form of glycogen phosphorylase is phosphorylated, while the dephosphorylation of which active form occurs?
Options- A. Glycogen synthase
- B. Glycogen semisynthase
- C. Glycogen hydrolase
- D. Glycogen dehydrogenase Discuss
Correct Answer: Glycogen synthase
- 8. When concentration of the reactants is higher than the equilibrium concentration then
Options- A. the gibbs free energy will be positive
- B. the gibbs free energy will be negative
- C. more products will be formed
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 9. Which of the following could act as an uncoupler of electron transport and ATP synthesis?
Options- A. The Fo base-piece of ATP synthase (without the Fl subunit)
- B. Dinitrophenol
- C. neither (a) nor (b)
- D. Both (a) and (b) Discuss
Correct Answer: Both (a) and (b)
- 10. A kinase is an enzyme that
Options- A. removes phosphate groups of substrates
- B. uses ATP to add a phosphate group to the substrate
- C. uses NADH to change the oxidation state of the substrate
- D. removes water from a double bond Discuss
Correct Answer: uses ATP to add a phosphate group to the substrate
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