Answer to Question #259471 in Biochemistry for Maria

Question #259471

in my teachers book (probably misstranslated from english, and she achieved her doctors degree with this work of copying) she says :

bacteria : the free transportors of electrons (not binded to de membrane) are : nicotine adenine dinucleotide and nicotinamide adenine dinucleotide phosphate, the couples NAD/NADP and NADP/NADPH , and they have a redox potential of -0,320, respectively, -0,324 V

As far as I know NAD is reduce to NAD^+/NADH and NADP is reduced to NADP^+/NADPH

I dont understand what „couples” mean here... and to be fair they are so strangely coupled i dont even believe that this is a correct association

Please, help me learn and not to learn without any logic!

Thank you very much and deeply grateful in advance

Expert's answer

NADP+ is a coenzyme that functions as a universal electron carrier, accepting electrons and hydrogen atoms to form NADPH, or nicotinamide adenine dinucleotide phosphate. NADP+ is created in anabolic reactions, or reaction that build large molecules from small molecules.

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