MCQ on Electron transport Chain
1. Which is the site of Electron Transport Chain?
a)
Mitochondrion
b) Outer
Mitochondrial membrane
c) Inner
Mitochondrial membrane
d)
Mitochondrial matrix
2. Which of the following are electron donors
during ETC?
a) NADH and FADH2
b) NADPH and FADH2
c) ATP, NADH and FADH2
d) NADH and FMN
This video will help you to refresh Electron Transport Chain in 10 minutes
3. The movement of electrons from NADH occurs via complex
Complex
I: NADH dehydrogenase
Complex II: Succinate
dehydrogenase
Complex
III: Cytochrome bc1
Complex IV:
Cytochrome c oxidase
a) 1-2-3-4
b) 1-3-4
c) 2-3-4
d) 1-4
4. Which is the terminal electron acceptor in ETC?
a) UQ
b) FAD
c) UQH2
d) O2
5. Which of the following is a membrane bound enzyme of Krebs cycle that
forms an enzyme complex in ETC?
a) NADH dehydrogenase
b) Succinate dehydrogenase
c) Cytochrome oxidase
d) Cytochrome reductase
6. The movement of electrons from FADH2 occurs via complex
a) 1-2-3-4
b) 1-3-4
c) 2-3-4
d) 1-4
7. The terminal electron acceptor O2 receives electrons from
a) Cyt c
b) Cyt c1
c) Cyt b
d) Cyt a
8. Which of the following statement is true regarding ATP synthase
a) Located in outer mitochondrial membrane;
F1 unit made up of ϒ3β3αδὲ
b) Located in inner mitochondrial membrane;
F1 unit made up of ϒ3β3αδὲ
c) Located in mitochondrial matrix;
F1 unit made up of ϒ3β3αδὲ
d) Located in inner mitochondrial membrane; F1 unit made up of ϒ3β3α3δὲ
9. Which of the following are the major events in ETC?
a) electron flow and release of
energy
b) proton gradient formation
c) PMF driven ATP synthesis
d) all of these
10. NADH binding site of the enzyme NADH dehydrogenase orient
towards
a) Mitochondrial
Intermembrane space
b) Outer
Mitochondrial membrane
c) Inner
Mitochondrial membrane
d)
Mitochondrial matrix
11. Which of the following protein complexes (Complex 1-4) acts as
proton pump?
Complex
I: NADH dehydrogenase
Complex II: Succinate
dehydrogenase
Complex
III: Cytochrome bc1
Complex IV:
Cytochrome c oxidase
a) 1 & 2
b) 1,3 & 4
c) 3 & 4
d) 2 & 4
12. Which of the following ions are vital in transferring electrons
to O2?
a) Ca
b) Fe
c) Mn
d) Cu
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Answers:
1. c) Inner Mitochondrial membrane
2. a) NADH and FADH2
3. b) 1-3-4
4. d) O2
5. b) Succinate dehydrogenase
6. c) 2-3-4
7. d) Cyt a (exactly Cyt a3)
8. b) Located in inner mitochondrial membrane; F1 unit made up of ϒ3β3αδὲ
9. d) all of these
10. d) Mitochondrial matrix
11. c) 3 & 4 (cytochromes are proton channels)
12. Cu
