NAD

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Nicotinamide adenine dinucleotide (NAD+) are vital carriers of electrons in processes such as the Cyclic Acid Cycle or Photosynthesis[1] . 

The co-enzyme has the ability to "pick up" two electrons and a hydrogen ion and is used in the cell to produce ATP.  When reduced, it becomes NADH and since it's a co-enzyme, it is able to pass on it's electrons to another carrier and is oxidised back to NAD+[2] .

References

 

  1. Berg J.M., Tymoczko J.L., Stryer L. (2012) Biochemistry, 7th Edition: New York: WH Freeman
  2. http://old.texarkanacollege.edu/~mstorey/botany/chp10.html