Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Electron Transport Chain

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

Multiple Choice Questions on Electron transport Chain

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 

Understand More 

MCQ on Chemiosmosis and ATP Synthesis

Diagram Quiz on Chemiosmosis and ATP synthesis

Notes on  Chemiosmosis and ATP synthesis Step wise Explanation

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

 


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