Q.

Identify the correct statement w.r.t. the location and function of ubiquinone.

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a

It is located within the inner membrane of the mitochondria and it transfers electron from complex I or II to complex III

b

It is located on outer surface of the inner membrane of the mitochondria and transfer of electrons between complex III and IV.

c

It is located on outer surface of the inner membrane  of the mitochondria and it transfers electron from complex I to complex II

d

It is located on outer surface of the inner membrane  of the mitochondria and it transfers electron from complex I to complex III

answer is A.

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Detailed Solution

Electrons from NADH produced in the mitochondrial matrix during citric acid cycle are oxidised by an NADH dehydrogenase (complex I), and electrons are then transferred to ubiquinone located within the inner membrane. It transfers electron from complex I to complex III. It can also transfer electrons from complex II to complex III.
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