Respiration
Multiple Choice Questions and Answers
1. Glycolysis takes place in
(a) cytoplasm
(b) chloroplast
(c) ribosome
(d) mitochondria
Answer: (a) cytoplasm
2. The end products of respiration in plants are
(a) carbon dioxide, water and energy
(b) starch and oxygen
(c) sugar and oxygen
(d) water and energy
Answer: (a) carbon dioxide, water and energy
3. The net gain of ATP molecules during glycolysis is
(a) 2
(b) 4
(c) 6
(d) 10
Answer: (a) 2
4. Energy rich compound produced during biological oxidation of glucose is
(a) pyruvic acid
(b) adenosine triphosphate
(c) acetoacetate
(d) adenosine monophosphate
Answer: (b) adenosine triphosphate
5. Glucose is oxidised in the cell in
(a) cytoplasm
(b) mitochondria
(c) chloroplast grana
(d) ribosome
Answer: (a) cytoplasm
6. Wine turns sour because of
(a) heat
(b) aerobic bacteria
(c) anaerobic bacteria
(d) exposure to light
Answer: (b) aerobic bacteria
7. Fermentation is
(a) an aerobic respiration
(b) an incomplete oxidation
(c) an excretory process
(d) none of these
Answer: (b) an incomplete oxidation
8. Fermentation is conducted by
(a) all bacteria
(b) all fungi
(c) some bacteria and some fungi
(d) all microorganisms
Answer: (b) an incomplete oxidation
9. Anaerobic respiration involves partly or wholly, the process of
(a) Krebs’ cycle
(b) glycolysis and Krebs’ cycle
(c) oxidative phosphorylation
(d) glycolysis
Answer: (d) glycolysis
10. The process of respiration and photosynthesis have one thing in common
(a) energy
(b) cytochrome
(c) chlorophyll
(d) enzyme
Answer: (b) cytochrome
11. Adenosine diphosphate contains
(a) one high energy bond
(b) two high energy bonds
(c) no high energy bonds
(d) 3 high-energy bonds
Answer: (b) two high energy bonds
12. Respiratory quotient of germinating castor seed is
(a) 1
(b) >1
(c) <1
(d) 0
Answer: (c) <1
13. Total ATP production during EMP pathway is
(a) 24 ATP molecules
(b) 8 ATP molecules
(c) 38 ATP molecules
(d) 6 ATP molecules
Answer: (b) 8 ATP molecules
14. The formation of acetyl coenzyme A from pyruvic acid is the result of its
(a) reduction
(b) dehydration
(c) dephosphorylation
(d) oxidative decarboxylation
Answer: (d) oxidative decarboxylation
15. Respiration in cell takes place in
(a) ribosomes
(b) nucleus
(c) golgi body
(d) mitochondria
Answer: (d) mitochondria
16. One of the products of anaerobic respiration is
(a) malic acid
(b) lactic acid
(c) pyruvic acid
(d) ethyl alcohol
Answer: (d) ethyl alcohol
17. Cytochromes in plant cells function mainly as
(a) oxygen acceptor
(b) carbon dioxide acceptor
(c) electron acceptor
(d) H2O acceptor
Answer: (c) electron acceptor
18. The end products of anaerobic respiration in plants are
(a) carbon dioxide, water and energy
(b) water and energy
(c) carbon dioxide and energy
(d) carbon dioxide and water
Answer: (a) carbon dioxide, water and energy
19. End product of glycolysis is
(a) pyruvic acid
(b) ethyl alcohol
(c) glucose
(d) carbon dioxide
Answer: (a) pyruvic acid
20. Conversion of sugar into alcohol during fermentation is due to the direct action of
(a) temperature
(b) microorganisms
(c) concentration of sugar solution
(d) zymase
Answer: (b) microorganisms
21. Biological oxidation and Krebs’ cycle involves
(a) N2
(b) CO2
(c) O2
(d) SO2
Answer: (c) O2
22. Under glycolysis, the pyruvic acid is reduced to lactic acid anaerobically in
(a) liver
(b) muscles
(c) skin
(d) brain
Answer: (b) muscles
23. The last or terminal cytochrome in respiratory chain is
(a) cytochrome a
(b) cytochrome a3
(c) cytochrome C
(d) cytochrome G
Answer: (b) cytochrome a3
24. Krebs’ cycle is otherwise called
(a) TCA cycle
(b) Citric acid cycle
(c) Tricarboxylic acid cycle
(d) All of these
Answer: (d) All of these
25. How many ATP molecules are produced by 1 gram molecule of glucose through aerobic respiration?
(a) 32
(b) 36
(c) 38
(d) 52
Answer: (c) 38
26. The link between glycolysis and citric acid cycle is
(a) NAD
(b) FAD
(c) Acetyl CoA
(d) none
Answer: (c) Acetyl CoA
27. The electron acceptor in ETS is
(a) rhycocyanin
(b) phycoerythrin
(c) cytochrome
(d) phytochrome
Answer: (a) rhycocyanin
28. In aerobic respiration electrons and protons are ultimately picked up by
(a) NAD
(b) FAD
(c) O2
(d) CO2
Answer: (c) O2
29. Mitochondria are the sites of
(a) oxidative phosphorylation
(b) photolysis
(c) photophosphorylation
(d) starch synthesis
Answer: (a) oxidative phosphorylation
30. Name the product which is formed in both aerobic and anaerobic respiration
(a) lactic acid
(b) citric acid
(c) isocitric acid
(d) pyruvic acid
Answer: (d) pyruvic acid
31. Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzyme
(a) carboxylase
(b) dehydrogenase
(c) phosphatase
(d) both a and b
Answer: (d) both a and b
32. The site of anaerobic respiration is
(a) ribosome
(b) nucleus
(c) vacuoles
(d) cytoplasm
Answer: (d) cytoplasm
33. The acceptor substance of Krebs’ cycle is
(a) Acetyl CoA
(b) Pyruvic acid
(c) Oxalo Acetic Acid
(d) Citric acid
Answer: (c) Oxalo Acetic Acid
34. Anaerobic respiration is also called
(a) fermentation
(b) restoration
(c) fragmentation
(d) multiplication
Answer: (a) fermentation
35. There are three classes of career molecules in ETS. The third class is
(a) cytochromes
(b) flavoproteins
(c) coenzyme
(d) none of these
Answer: (c) coenzyme
36. The pyruvic acid found in glycolysis is oxidised to CO2 and H2O in a cycle called
(a) Calvin cycle
(b) Hill reaction
(c) Krebs’ cycle
(d) Nitrogen cycle
Answer: (c) Krebs’ cycle
37. A molecule of Acetyl CoA has C atoms numbering
(a) 3
(b) 2
(c) 4
(d) 6
Answer: (b) 2
38. RQ for fat is
(a) more than 1
(b) 0
(c) one
(d) less than one
Answer: (d) less than one
39. Krebs’ cycle occurs in
(a) inner membrane of mitochondrion
(b) outer membrane of mitochondrion
(c) matrix of mitochondrion
(d) perimitochondrial space of mitochondria
Answer: (c) matrix of mitochondrion
40. ATPase activity takes place inside
(a) head of F1 particle
(b) base of F1 particle
(c) stalk of F1 particle
(d) all of the above
Answer: (a) head of F1 particle
41. Energy for ATP synthesis is derived from
(a) hydrogen ion gradient
(b) oxygen ion gradient
(c) nitrogen ion gradient
(d) all of these
Answer: (a) hydrogen ion gradient
42. In Krebs’ cycle, a cyclic metabolic pathway is located in the
(a) matrix of mitochondria
(b) outer membrane of mitochondria
(c) both a and b
(d) chloroplast and mitochondria
Answer: (a) matrix of mitochondria
43. Yeast and bacteria during anaerobic respiration yield
(a) molecular oxygen
(b) nitrogen
(c) carbon dioxide
(d) none of these
Answer: (c) carbon dioxide
44. The oxidation of one NADPH2 yeilds
(a) 1 ATP
(b) 2 ATP
(c) 3 ATP
(d) 38 ATP
Answer: (c) 3 ATP
45. A sudden change from anaerobic to aerobic process is called
(a) Blackman’s Law
(b) Emerson effect
(c) Chargaff rule
(d) Pasteur effect
Answer: (d) Pasteur effect
46. Aerobic repiratory pathway is appropriately termed
(a) anabolic
(b) catabolic
(c) amphibolic
(d) parabolic
Answer: (c) amphibolic
47. Enzyme of TCA cycle are present in
(a) chloroplast
(b) mitochondria
(c) ribosome
(d) nucleus
Answer: (b) mitochondria
48. In Krebs’ cycle of oxalo acetic acid accepts acetyl CoA to form
(a) citric acid
(b) oxalosuccinate
(c) fumarate
(d) succinyl CoA
Answer: (a) citric acid
49. One molecule of NADPH2 is equivalent to how many ATP molecules
(a) 1
(b) 3
(c) 5
(d) 7
Answer: (b) 3
50. ATP was discovered by
(a) Blackman
(b) Bowman
(c) Lipmann
(d) Karl Lohmann
Answer: (c) Lipmann