Question

In mitochondrion, which electron carrier transfers electrons from complex II to complex III?

(1) Flavoprotein
(2) Cytochrome c
(3) Ubiquinone
(4) Copper atom
(5) Iron-sulfur protein

Answer 1

Ubiquinone, or coenzyme Q, carries electrons from complex II to complex III in the mitochondrial electron transport chain.

Step-by-step explanation:

The electron carrier that transfers electrons from complex II to complex III in the mitochondrion is ubiquinone (also known as coenzyme Q). Ubiquinone is a hydrophobic electron carrier molecule that moves within the lipid bilayer of the inner mitochondrial membrane, delivering electrons from both complex I and II to complex III. Once at complex III, electrons are passed to cytochrome c, which then carries them to complex IV.