Question

Which of the following is not a component of mitochondrial electron transport system?
(a) Ubiquinone
(b) Cytochrome b₆
(c) Cytochrome C
(d) Cytochromes a and a₃

Answer 1

ᴜʙɪǫᴜɪɴᴏɴᴇ...................

Answer 2

Answer:

The correct answer for this is option b i.e. Cytochrome b6.

Explanation:

Cytochrome b₆f complex is an enzyme found in the thylakoid membrane in chloroplasts of green plants that catalyzes the transfer of electrons from plastoquinol to plastocyanin.

• While the other options- ubiquinone, Cytochrome C, Cytochrome a, and a 3 are the parts of the electron transport chain. These are present in the inner mitochondrial membrane.

• Cytochrome C helps in transferring electrons from complex III to complex IV.

• Cytochrome a and a3 transfer electrons and catalyzes the reaction of oxygen to water.

• Ubiquinone is a mobile component of the mitochondrial electron transport chain. UQ acts as a membrane antioxidant.

Picture showing the components of the mitochondrial electron transport system is attached below.