How many ATP equivalents are produced by the oxidation of succinate into fumarate

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Solution

The correct option is B 2
In the 6th step of Krebs cycle, oxidation of succinate occurs. Succinate undergoes dehydrogenation (removal of hydrogen) to form fumarate with the help of a membrane based enzyme succinate dehydrogenase. ${FADH}_{2}$ is produced in this step. 1 ${FADH}_{2}$ is equivalent to 2 ATP.

$succinate + FAD succinate dehydrogenase - ------------- \to fumarate + {FADH}_{2}$

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