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NAD is a _________

(a) enzyme

(b) cofactor

(c) protein

(d) nucleoside

This question was addressed to me by my college professor while I was bunking the class.

The doubt is from Metabolism topic in portion Bioenergetics, Enzymes, Metabolism, Genes, Chromosomes and Genomes of Cell Biology

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Correct option is (b) cofactor

To explain: Nicotinamide adenine dinucleotide is a non-protein cofactor called coenzyme. NAD plays a key role in the metabolism of the cell by donating and accepting electrons.

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