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
Which of the following is not a significant biological oxidizing agent?
A. FAD
B. Fe3+
C. O2
D. NAD+
Question 2
The aerobic breakdown of glucose known as respiration involves
A. electron transport phosphorylation
B. glycolysis
C. Krebs Cycle
D. all of the above
Question 3
FAD is reduced to FADH2 during
A. electron transport phosphorylation
B. lactate fermentation
C. Krebs cycle
D. glycolysis
Question 4
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
Question 5
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
Question 6
Products of glucose oxidation essential for oxidative phosphorylation are ____________
A. Pyruvate
B. Acetyl co-A
C. NADPH and ATP
D. NADH and FADH2
Question 7
Lactic acid is produced by human muscles during strenuous exercise because of lack of
A. oxygen
B. NAD+
C. glucose
D. ADP and Pi
Question 8
In metabolism, NAD is involved in ____________
A. Spontaneous reaction
B. Elimination reaction
C. Redox reactions
D. None of the mentioned
Question 9
In aerobic respiration, the compound that enters a mitochondrion is
A. acetyl CoA
B. pyruvate
C. phosphoglyceraldehyde
D. oxaloacetate
Question 10
A biological redox reaction always involves
A. an oxidizing agent
B. a gain of electrons
C. a reducing agent
D. all of these
Question 11
The carbon dioxide is primary a product of
A. Krebs cycle
B. glycolysis
C. electron transport phosphorylation.
D. lactate fermentation.
Question 12
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
Question 13
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
Question 14
What is the rate of electron transfer when proton motive force is high?
A. Faster
B. Slower
C. Moderate
D. None
Question 15
The complete oxidation of glucose yields usable energy in the form of
A. FADH2
B. coenzyme A
C. ATP
D. pyruvic acid
Question 16
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
Question 17
What is the proportion of ATP produced by oxidative phosphorylation?
A. 60%
B. 70%
C. 80%
D. 90%
Question 18
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
Question 19
NADP+ in its reduced form is ____________
A. NAD
B. NADH
C. NADPH
D. DPH
Question 20
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
Question 21
How many CO2 molecules are exhaled for each O2 molecule utilized in cellular respiration?
A. 1
B. 3
C. 6
D. 12
Question 22
During glycolysis, electrons removed from glucose are passed to
A. FAD
B. NAD+
C. acetyl CoA
D. pyruvic acid
Question 23
NADP is a cofactor used in ____________
A. Catabolic reactions
B. Anabolic reactions
C. Elimination reaction
D. Redox reactions
Question 24
Where does oxidative phosphorylation take place?
A. Ribosomes
B. Nucleus
C. Mitochondria
D. Cell membrane
Question 25
In electron transport, electrons ultimately pass to
A. ADP
B. cytochrome b
C. oxygen
D. none of these
Question 26
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