any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
any of a group of organic substances essential in small quantities to normal metabolism
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
the blood group whose red cells carry the A antigen
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
the 1st letter of the Roman alphabet
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
the 1st letter of the Roman alphabet
the basic unit of electric current adopted under the Systeme International d'Unites
