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In fermentation, which of the following is regenerated?

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In fermentation, which of the following is regenerated?

(a) Starch

(b) Oxygen

(c) NAD⁺

(d) NADH

This question was addressed to me during an online interview.

My doubt is from Metabolism in division Bioenergetics, Enzymes, Metabolism, Genes, Chromosomes and Genomes of Cell Biology

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Right option is (c) NAD⁺

To explain I would say: Cells are able to regenerate NAD⁺ by fermentation. In this process the transfer of electrons take place from NADH to pyruvate or to a compound derived from pyruvate.

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