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Oxidative Phosphorylation MCQ Questions & Answers

Oxidative Phosphorylation MCQs : This section focuses on the "Oxidative Phosphorylation". These Multiple Choice Questions (MCQs) should be practiced to improve the Oxidative Phosphorylation skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

How many CO2 molecules are exhaled for each O2 molecule utilized in cellular respiration?

A. 1
B. 3
C. 6
D. 12

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Question 2

Which of the following is not a feature of oxidative phosphorylation?

A. Direct transfer of phosphate from a substrate molecule to ADP
B. An electrochemical gradient across the inner mitochondrial membrane
C. A membrane bound ATP synthase
D. A protonmotive force

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Question 3

A biological redox reaction always involves

A. an oxidizing agent
B. a gain of electrons
C. a reducing agent
D. all of these

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Question 4

During glycolysis, electrons removed from glucose are passed to

C. acetyl CoA
D. pyruvic acid

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Question 5

The complete oxidation of glucose yields usable energy in the form of

B. coenzyme A
D. pyruvic acid

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Question 6

During electron transport, protons are pumped out of the mitochondrion at each of the major sites except for

A. complex I
B. complex II
C. complex III
D. complex IV

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Question 7

Coenzyme Q is involved in electron transport as

A. directly to O2
B. a water-soluble electron donor
C. covalently attached cytochrome cofactor
D. a lipid-soluble electron carrier

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Question 8

Which of the following is correct sequence of processes in the oxidation of glucose?

A. Krebs cycle - glycolysis - electron transport
B. Glycolysis - Krebs cycle - eletron transport
C. Electron transport - Krebs cycle - glycolysis
D. Krebs cycle - electron transport - glycolysis

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Question 9

The carbon dioxide is primary a product of

A. Krebs cycle
B. glycolysis
C. electron transport phosphorylation.
D. lactate fermentation.

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Question 10

What happens after glycolysis when oxygen is available as an electron acceptor?

A. Pyruvate is formed
B. NADH is produced
C. Fermentation
D. Oxidative phosphorylation

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Question 11

Lactic acid is produced by human muscles during strenuous exercise because of lack of

A. oxygen
C. glucose
D. ADP and Pi

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Question 12

FAD is reduced to FADH2 during

A. electron transport phosphorylation
B. lactate fermentation
C. Krebs cycle
D. glycolysis

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Question 13

The aerobic breakdown of glucose known as respiration involves

A. electron transport phosphorylation
B. glycolysis
C. Krebs Cycle
D. all of the above

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Question 14

Which of the following is not a significant biological oxidizing agent?

B. Fe3+
C. O2

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Question 15

In electron transport, electrons ultimately pass to

B. cytochrome b
C. oxygen
D. none of these

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Question 16

In aerobic respiration, the compound that enters a mitochondrion is

A. acetyl CoA
B. pyruvate
C. phosphoglyceraldehyde
D. oxaloacetate

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Question 17

In metabolism, NAD is involved in ____________

A. Spontaneous reaction
B. Elimination reaction
C. Redox reactions
D. None of the mentioned

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Question 18

NADP is a cofactor used in ____________

A. Catabolic reactions
B. Anabolic reactions
C. Elimination reaction
D. Redox reactions

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Question 19

NADP+ in its reduced form is ____________


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Question 20

Products of glucose oxidation essential for oxidative phosphorylation are ____________

A. Pyruvate
B. Acetyl co-A

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Question 21

The magnitude of proton motive force depends on ____________

A. Energy charge of cell
B. Permeability of membrane
C. Number of ribosomes in cell
D. None of the mentioned

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Question 22

The regulation of oxidative phosphorylation depends on ____________

A. Magnitude of ion motive force
B. Magnitude of electron motive force
C. Magnitude of proton motive force
D. None of the mentioned

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Question 23

What is the proportion of ATP produced by oxidative phosphorylation?

A. 60%
B. 70%
C. 80%
D. 90%

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Question 24

What is the rate of electron transfer when proton motive force is high?

A. Faster
B. Slower
C. Moderate
D. None

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Question 25

Where does oxidative phosphorylation take place?

A. Ribosomes
B. Nucleus
C. Mitochondria
D. Cell membrane

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Question 26

Which effects the increased levels of hydrogen ions in the inter-membrane space of the mitochondria?

A. Increase ATP production
B. Decreased levels of oxidative phosphorylation
C. Increased levels of water in inter-membrane space
D. Decreased levels of chemiosmosis

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