Question

Number of cytochrome complexes present in the electron transport chain in mitochondria is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

In the electron transport chain, the electrons are transferred through the series of co-enzymes and cytochromes.

This chain consists of four complexes as shown in the above figure.

In electron transport chain there are two cytochrome complexes, viz; cytochrome bc${}_1$ and cytochrome c oxidase.

The first cytochrome complex consists of cytochrome b, FeS complex and cytochrome c${}_1$. Here cytochrome c1 transfers the electron to cytochrome c.

The second cytochrome complex consists of cytochrome a and cytochrome a${}_3$. This complex helps transfer the electron to oxygen.

Thus cytochromes are present in the electron transport chain, which are required for the transfer of electrons.