A

This is an old revision of this page, as edited by Joaquín Martínez (talk | contribs) at 02:59, January 20, 2012. It may differ significantly from current revision.

"A" represents:

Adenine, which is a purine base in DNA and RNA; "A" pairs with thymine in DNA or uracil in RNA.
Adenosine, which is the the nucleoside containing adenine as its base.
Amperes, a unit of electric current