Cell Respiration Quiz | Cell Respiration Multiple Choice Questions and Answers

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Questions
1 When yeast ferments glucose, the products obtained are
A ethanol and CO2
B methanol and CO2
C ethanol and water
D water and CO2.

Answer: ethanol and CO2
2 The First phase in the breakdown of glucose, in animal cell, is
A fermentation
B Krebs cycle
C glycolysis
D E.T.S.

Answer: glycolysis
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3 Life without air would be
A reductional
B free from oxidative damage
C impossible
D anaerobic

Answer: anaerobic
4 Out of 38 ATP molecules produced per glucose, 32 ATP molecules are formed from NADH/FADH2 in
A respiratory chain
B Krebs cycle
C oxidative decarboxylation
D EMP

Answer: respiratory chain
5 End product of citric acid cycle/Krebs cycle is
A citric acid
B lactic acid
C pyruvic acid
D CO2 + H2O

Answer: CO2 + H2O
6 Apparatus to measure rate of respiration and R.Q. is
A auxanometer
B potometer
C respirometer
D manometer

Answer: respirometer
7 Oxidative phosphorylation is production of
A ATP in photosynthesis
B NADPH in photosynthesis
C ATP in respiration
D NADH in respiration

Answer: ATP in respiration
8 At a temperature above 35°C
A rate of photosynthesis will decline earlier than that of respiration
B rate of respiration will decline earlier than that of photosynthesis
C there is no fixed pattern
D both decline simultaneously

Answer: rate of photosynthesis will decline earlier than that of respiration
9 End products of aerobic respiration are
A sugar and oxygen
B water and energy
C carbon dioxide, water and energy
D carbon dioxide and energy

Answer: carbon dioxide, water and energy
10 Link between glycolysis, Krebs cycle and P-oxidation of fatty acid or carbohydrate and fat metabolism is
A oxaloacetic acid
B succinic acid
C citric acid
D acetyl CoA

Answer: acetyl CoA
11 Out of 36 ATP molecules produced per glucose molecule during respiration
A 2 are produced outside glycolysis and 34 during respiratory chain
B 2 are produced outside mitochondria and 34 inside mitochondria
C 2 during glycolysis and 34 during Krebs cycle
D All are formed inside mitochondria

Answer: 2 are produced outside mitochondria and 34 inside mitochondria
12 Terminal cytochrome of respiratory chain which donates electrons to oxygen is
A Cyt. b
B Cyt. c
C Cyt. A1
D Cyt. a3.

Answer: Cyt. a3.
13 Connecting link between glycolysis and Krebs cycle before pyruvate entering Krebs cycle is changed to
A oxaloacetate
B PEP
C pyruvate
D acetyl CoA

Answer: acetyl CoA
14 EMP can produce a total of
A 6 ATP
B 8 ATP
C 24 ATP
D 38 ATP

Answer: 8 ATP
15 R.Q- is ratio of
A CO2 produced to substrate consumed
B CO2 produced to O2 consumed
C oxygen consumed to water produced
D oxygen consumed to CO2 produced.

Answer: CO2 produced to O2 consumed
16 End product of glycolysis is
A acetyl CoA
B pyruvic acid
C glucose I-phosphate
D fructose I-phosphate

Answer: pyruvic acid
17 R.Q. is
A C/N
B N/C
C CO2/O2
D O2/CO2

Answer: CO2/O2
18 NADP+ is reduced to NADPH is
A HMP
B Calvin Cycle
C Glycolysis
D EMP

Answer: HMP
19 Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as
A TCA-pathway
B glycolysis
C HMS-pathway
D Krebs cycle

Answer: glycolysis
20 The ultimate respiratory substrate, yielding maximum number of ATP molecules, is
A glycogen
B ketogenic amino acid
C glucose
D amylose

Answer: glucose
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