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Krebs Cycle

In which of t...

Question

In which of the following reduction of NAD does not occur?

Isocitric acid

\to

α

-ketoglutaric acid

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Malic acid

\to

oxaloacetic acid

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Pyruvic acid

\to

acetyl coenzyme

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Succinic acid

\to

fumaric acid

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Solution

The correct option is C Succinic acid $\to$ fumaric acid
The conversion of succinic acid to fumaric acid is one of the steps in the Krebs cycle. The conversion is catalyzed by the enzyme succinic dehydrogenase and $F A D$ is reduced to $F A D H_{2}$ . Thus the correct answer is option D.

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N A D^{+}

^{+}

\to

\to

\to

\to

C O_{2}

\begin{matrix} I . C i t r i c a c i d & \to & α - k e t o g l u t a r i c a c i d I I . S u c c i n i c a c i d & \to & M a l i c a c i d I I I . M a l i c a c i d & \to & O x a l o a c e t i c a c i d I V . α - k e t o g l u t a r i c a c i d & \to & S u c c i n y l C o - A \end{matrix}

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