Coenzyme Q oxidized by complex III is reduced by: A) complex I B) complex II C)...

Coenzyme Q oxidized by complex III is reduced by:

A) complex I

B) complex II

C) complex III

D) complex IV

E) Glycerol 3-phosphate dehydrogenase

Expert Solution

Oxidation means loss of electrons.
Reduction means gain of electrons.

Electron transport chain:-
• This is series of electron transporters situated at inner mitochondrial membrane, which release electrons from NADH and FADH2 and forms ATP.
It is formed by five complexes, Coenzyme Q and cytochrome C.

• Complex 1 gets electron from NADH and Complex 2 gets electrom from FADH2.
• Both complex 1 and 2 transfer their electrons to coenzyme Q.
• Coenzyme Q receives electrons means, it reduced by both complex 1 and 2.
• Complex 3 receives electrons from coenzyme Q , here coenzyme Q losses electrons means it is oxidised and complex 3 receives electrons means it is reduced.

Summary -
• Complex 1 and 2 reduce coenzyme Q, or coenzyme Q oxidises conplex 1 and 2.
• Coenzyme Q reduces complex 3, or complex 3 oxidises coenzyme Q.
Hence this series go on...

Now in question,
Option (A) and (B) both are correct answers.
Complex 3 receives electrons from both complex 1 and 2, hence it is reduced by both complex 1 and 2.

Other options -
• Complex 3 - it reduces cytochrome C.
• Complex 4 - it reduces molecular oxygen and concert it into water molecules.
• Glycerol 3 phosphate dehydrogenase - not involved in this series.

gladiator answered 2 years ago

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