In citric acid cycle, the step not using dehydrogenase enzymes is

Malic acid to oxaloacetate.

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Succinate to fumarate.

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Oxaloacetate to citric acid.

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Citric acid to -ketoglutarate.

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Solution

The correct option is D Oxaloacetate to citric acid.
Malic acid converts into oxaloacetate in the presence of Malic dehydrogenase.
Succinate converts into fumarate in the presence of Succinic dehydrogenase.
Oxaloacetic acid forms citric acid in the presence of enzyme citrate synthetase.
Citric acid converts into alpha-ketoglutarate in stepwise reactions.
So the correct option is 'Oxaloacetate to citric acid'.

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