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Question
FAD is electron acceptor during oxidation of which of the following?
Options:
A .  α-ketoglucarate -> Succinyl Co-A
B .  Succinic acid  -> Fumaric acid
C .  Succinyl Co-A -> Succinic acid
D .  Fumaric acid  ->  Malic acid
Answer: Option B
:
B
In Kreb’s cycle, when succininc acid undergoes oxidation or dehydrogenation to form fumaric acid, two hydrogens are transferred to FAD. FAD is reduced to FADH2 and enzyme involved in this step is succinic acid dehydrogenase.

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