Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Respiration

16.The ultimate respiratory substrate, yielding a maximum number of ATP molecules, is
a) glycogen
b) glucose
c) amylose
d) ketogenic amino acid
17. End product of citric acid/ Kreb’s cycle is
Citric acid Cycle
a) citric acid
b) pyruvic acid
c) latic acid
d) carbon dioxide and water
18. The first phase in the breakdown of glucose, in an animal cell, is
a) glycolysis
b) E.T.S
c) Kreb’s cycle
d) Glycolysis
19. End product of fermentation is
a) O2 and C2H5OH
b) CO2 and O2
c) CO2 and C2H5OH
d) CO2 and acetyaldehyde

20. Out of 36 ATP molecules produced per glucose molecule during respiration
a) 2 are produced outside glycolysis and 34 during repiratory chain
b) 2 are produced outside mitochondria and 34 inside the mitochondria
c) all the formed inside mitochondria
d) 2 during glycolysis and 34 during Krebs cycle
21. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as
a) TCA pathway
b) Glycolysis
c) HMS pathway
d) Glycolysis
22. When one glucose molecule is completely oxidized, it changes
a) 36 ADP molecules into 36 ATP molecules
b) 38 ADP molecules into 38 ATP molecules
c) 30 ADP molecules into 30 ATP molecules
d) 32 ADP molecules into 32 ATP molecules
23. Link between glycolysis, Kreb’s cycle, and β oxidation of fatty acid or carbohydrate and fat metabolism is
a) citric acid
b) succinic acid
c) acetyl CoA
d) Oxaloacetic acid
24. Terminal cytochrome of respiratory chain which donates electrons to oxygen is

Electron transport Chain
a) Cyt. b
b) Cyt.a1
c) Cyt.c
d) Cyt.a3

25. R. Q is ratio of
a) CO2 produced to substarate consumed
b) CO2 produced to O2 consumed
c) oxygen consumed to CO2 produced
d) Oxygen consumed to water produced 
26. Most cancer cells exhibit increased glycolysis for generation of ATP as a main source of their energy supply. This phenomenon is known as: 
a) Pasteur effect 
b) Emerson enhancement effect 
b) Warburg effect 
d) None of the above
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16. b) glucose
17. d) carbon dioxide and water
18. a) glycolysis
19. c) CO2 and C2H5OH
20.b) 2 are produced outside mitochondria and 34 inside the mitochondria
21. b) Glycolysis
22. b) 38 ADP molecules into 38 ATP molecules
23. c) acetyl CoA
24. d) Cyt.a3
25. b) CO2 produced to O2 consumed
26. c) Warburg effect 

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