Question

Which of the following carrier receives reducing equivalents via FADH₂? OUQ Cyt C₁ Cyt b FMN​

Answer 1

Answer:

OUQ

Explanation:

OUQ also called as succinate dehydrogenase complex or complex 2 receives the reducing equivalents via FADH2

Answer 2

Answer: Coenzyme Q or Ubiquinone (Here written as OUQ)which is a unique electron carrier receives reducing equivalents from FADH₂.

Explanation:

Ubiquinone is a mobile electron carrier.

In the electron transport chain as electrons are passed on from complex 1 to complex 2 which is succinate dehydrogenase complex following steps occur:

• succinate oxidizes to fumarate,2 electrons are accepted by FAD in complex 2
• FAD passes its electrons to FeS clusters and then to CoQ
• Coenzyme Q also known as ubiquinone undergoes reduction in the presence of FADH₂

Thus CoQ receives reducing equivalents from FADH₂ and undergoes further reduction to semiquinone (CoQH) and ubiquinol(CoQH₂).