Question

a false statement regarding cytochrome c oxidase complex in ETS in mitochondria is
a.receives electrons directly from ubiquinone b.capable of reducing oxygen
c.extend across the thickness of inner mitochondria membrane
d.contains fe and cu both

Answer 1

Answer:

d

Explanation:

it contains 2 copper centres not iron

Answer 2

Answer:

Option a - receiving electrons directly from ubiquinone is a false statement given regarding cytochrome c oxidase complex in ETS in Mitochondria.

Explanation:

• Ubiquinone receives electrons from complex I and II and delivers them to complex III in the electron transport chain.
• The third complex, complex III, then pumps protons across the membrane and transfers electrons to cytochrome c, which is then transported to the fourth complex, cytochrome c-oxidase.
• The transmembrane protein cytochrome c-oxidase has two heme groups carrying iron and two copper-containing centres.
• It eventually carries the electrons to molecule oxygen, resulting in the formation of water.

Hence, receiving the electron from the ubiquinone directly is a false statement given.

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