Which statement correctly pairs nicotinamide adenine dinucleotide with its oxidation state?
ANADH is the oxidized form and NAD plus is reduced
BNAD plus is the oxidized form and NADH is reduced
CBoth NAD plus and NADH are oxidized forms
DBoth NAD plus and NADH are reduced forms
Answer & Solution
Correct answer: B. NAD plus is the oxidized form and NADH is reduced
1. The carrier exists in two states, one that has accepted electrons and one that has not.
2. NAD plus is the oxidized form of the molecule.
3. NADH is the reduced form, reached after it has accepted two electrons and a proton.
4. Reversing the two is the commonest slip here, because NADH looks like the simpler name.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.1 Energy in Living Systems_
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