| the blood group whose red cells carry the A antigen | (biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell |
| the 1st letter of the Roman alphabet | |
| the basic unit of electric current adopted under the Systeme International d'Unites | |
| a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation | |
| any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | |
| one of the four nucleotides used in building DNA, also known as deoxyadenylate, or dAMP; all four nucleotides have a common phosphate group and a sugar (ribose) | |
| (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA | |