Ubiquinone receives reducing equivalents from

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(D) In the electron transport system $(ETS)$,ubiquinone (coenzyme $Q$) acts as a mobile electron carrier.It receives electrons from complex-$I$ ($NADH

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Both $(b) \& (c)$

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(D) In the electron transport system $(ETS)$,ubiquinone (coenzyme $Q$) acts as a mobile electron carrier.It receives electrons from complex-$I$ ($NADH$ dehydrogenase) via $NADH + H^+$ and from complex-$II$ (succinate dehydrogenase) via $FADH_2$.Therefore,ubiquinone receives reducing equivalents from both $NADH + H^+$ and $FADH_2$.

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