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Question

Phosphogluconate shunt occurs in

A
Mitochondria
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B
Chloroplasts
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C
Cytoplasm
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D
Both A and B
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Solution

The correct option is C Cytoplasm
The reactions of hexose monophosphate shunt occur exclusively in the cytoplasm and is an additional pathway of glucose metabolism which starts with glucose-6-phosphate. About 10-25% of glucose is metabolised by this pathway. In plants, it occurs both in cytosol and plastids. This pathway involves both oxidative and nonoxidative steps. The oxidative steps generate NADPH and ribose-5-phosphate and then non-oxidative steps convert ribose-5-phosphate back into glucose-6-phosphate which can be further utilized for NADPH generations by means of oxidative steps.
Thus, the correct answer is option C.

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