polenvaroos3545 polenvaroos3545

13-12-2022
Chemistry

Answered

how many molecules of qh2 are oxidized and how many molecules of q are reduced respectively, during the q cycle in complex iii?

Answer :

RioSengupta RioSengupta

20-12-2022

2 molecules of QH₂ are oxidized and one Q molecule is reduced respectively, during the Q cycle in complex iii.

Is QH₂ has been reduced or oxidized?

Complex 3 requires two steps to complete the process because cytochrome c can only accept one electron at a time. The reduced QH2 (ubiquinol) transfers electrons to become an oxidized form of QH in the second step. Consequently, it is the best choice.

The Q cycle is the mechanism by which the electrons are moved from ubiquinol to cytochrome c. This cycle is actually made up of two smaller cycles, or half-cycles. A ubiquinol molecule binds to complex III during the first half-cycle and transfers the two electrons to the complex.

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