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Question

Hydration reaction occurs in Krebs cycle during conversion of

A
Acetyl CoA to citric acid
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B
α-ketoglutarate to succinyl CoA
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C
Succinate to fumarate
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D
Fumarate to malate
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Solution

The correct option is D Fumarate to malate
In the Krebs cycle hydration reaction occurs in two steps of cycle. First hydration reaction occurs in the third step during the conversion of cis aconitate to isocitrate in the presence of enzyme aconitase. The second hydration reaction occurs in second last step of Krebs cycle in which fumarate changes into 4-carbon malate in the presence of water and an enzyme fumarase.
Thus, the correct answer is option D.

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