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Redox reactions

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(a) Oxidized compound X receives electrons from reduced compound Y. In this case, Y serves as a reducing agent, and upon donating its electrons, it becomes oxidized. Y can now serve as an oxidizing agent, capable of receiving electrons from a reduced compound (not necessarily X). (b) NAD+ is composed of two nucleotides, one with an adenine base and one with a nicotinamide base. The oxidation of organic molecules releases electrons that can bind to NAD+ and (along with a hydrogen ion) result in the formation of NADH. The two electrons and H+ are incorporated into the nicotinamide ring. Note: The actual net charges of NAD+ and NADH are minus one and minus two, respectively. They are designated NAD+ and NADH to emphasize the net charge of the nicotinamide ring, which is involved in many oxidation–reduction reactions.
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