Respiration MCQs with Answers
1. For each glucose molecule that is broken down in glycolysis there is a net gain of
(a) 1 ATP molecule
(b) 8 ATP molecules
(c) 3 ATP molecules
(d) 4 ATP molecules
2. Which of the following enzymes catalyses non-reversible reaction in glycolysis?
(c)Triose phosphate isomerase
(d) Phosphohexose isomerase
3. Glucose 6 phosphate inhibits which of the following enzymes?
(c) Phosphorylase kinase
(d) Fructose-1, 6-bisphosphatase
4. Glucokinase is characterised by
(a) it has a much higher Michaelis constant for glucose than hexokinase
(b) it is an allosteric enzyme
(c) it is found in most cells
(d) it phosphoryiates most hexoses
5. The oxidation of 1 mole of glucose by anaerobic glycolysis yields a net of
(a) 2 moles of acetyl Co-A and 2 moles of ATp
(b) 2 moles of lactate and 2 moles of ATP
(c) 2 moles of lactate, 2 moles of NAD and 6 moles of ATP
(d) 2 moles of lactate, 2 moles of NADH and 2 moles of ATP
6. The end product of fermentation of molasses by yeast is
(b) ethyl alcohol
(d) methyl alcohol
7. Flouride inhibits which glycolytic enzyme
(d) lactate dehydrogenase
8. Iodoacetate inhibits which glycolytic enzyme
(c) glyceraldehyde 3 phosphate dehydrogenase
(d) phosphoglycerate kinase
9. Glycolysis occurs in
(c) Both (a) and (b)
10. Which enzyme is not present in muscle?
(b) Glucose 6 phosphatase
(c) Glycogen synthase
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11. Which glycolytic enzyme ia used in luconeogenesiat
(a) Pyruvale kinase le
(d) Phosphogyoerate kinase
12. Which enzyme cleaves C-Cbond in glycolysist
(a) Aldolase tid
(c) Phosphogycerate kinase
(d) Phosproglycerate mutase
13. Which enzyme is inhibited by arsenate?
(a) Glyceraldehyde 3 phosprate dehydrogenase
(b) Lactate dehydrogenase
14. In embryo with complete deficiency of pyruvate kinase, how many net moles of ATP would be generated in conversion of one mole of glucose to one mole of pyruvate?
15. Malonate is an Inhibitor of
(a) citrate synthase
(c) succinate dehydrogenase
(d) malate dehydrogenase
16. Which enzyme in TCA cycle is involved in formation of GTP from GDP?
(a) Succinate dehydrogenase
(b) Malate dehydrogenase
(c) Citrate synthase
(d) Succinyt Co-A synthetase
17. Which vitamin is required for the synthesis of cofactor needed for in conversion of succinate to fumarate
(c) Lipoic acid
18. Which of the following is utilised as precursor for choiesterol biosynthesis?
(a) Succinyl Co-A
(b) Acetyl Co-A
19. How many molecules of CO, are produced per mole of acetyl Co-A in TCA cycle?
20. Which of the following is a component of succinate dehydrogenase in electron transport chain?
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21. Which of the following ETC components accepts only one electron?
(b) Oxygen esk
22. Which of the following enzymes catalyses the conversion of hydrogen peroxide to water?
23. Choose a site along ETC that is ot coupled to ATF synthesis.
(a) Succinate Co Q reductase
(b) Cytochrome axidase
(c) NADH Co Q reductase
(d) None of the above
24. ADP transport into mitochondrial matrix is
(a) directly inhibited by valinomycin
(b) accompanied by ATP export from mitochondrial matrix
(c) inhibited by rotenone
(d) an active transport process
25. Which process does not involve cytochrome-c?
(b) TCA cycle
(c) Electron transport
(d) Oxidative phosphorylation
26. How many ATPS are formed per glucose molecule in Krebs’ cycle?
27. Number of oxygen molecules required during glycolysis of one glucose molecule is
28. Which is rich in energy?
29. What occurs in glycolysis?
30. Cytochrome possess
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31. Krebs’ cycle is considered to be important because of
(a) production of pyruvic acid
(b) production of oxalo acetic acid
(c) production of ATP through oxidative phosphorylation
(d) production of H2O
32. ATP is a
(b) enzyme which bring oxidase
(c) a molecule with high energy phosphate bonds
33. Mitochondria as an organellele is concerned with
(a) cellular respiration
(b) protein synthesis
(c) DNA synthesis
(d) cellular digestion
34. For glycolysis to occur, enzymes are found inside the
(b) mitochondrial matrix
35. The number of ATP molecules produced by one molecule of glucose is
36. Identify the number of ATP molecules produced outside mitochondria during glucose oxidation.
37. Glycolysis takes place mostly in
(a) white muscle fibres
(b) red muscle fibres
(c) liver cells
(d) All living cells
38. Which out of these links EMP with TCA cycle?
(a) Acetyl Co-A
(b) Pyruvic acid
(c) Oxaloacetic acid
39. In Krebs’ cycle the 6C compound is formed by the combination of acetyl Co-A with
(b) maleic acid
(c) isocitric acid
(d) oxaloacetic acid
40. Identify the common element to be found between NA and ATP is
41. Which cytochrome has both Cu and Fe elements?
42. Which is the rate limiting enzyme in glycolysis?
(d) Phosphofructose kinase
43. Which is not a prosthetic group or coenzyme used during oxidation of pyruvate?
(c) Lipoic acid
44. The end products produced in ETC is
(c) ATP + H2O
45. ETC in eukaryotes involves
(a) oxidation reaction
(b) reduction reaction
(c) redox reaction
(d) None of these