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C

• A base found in dna and rna and derived from pyrimidine; pairs with guanine.

• An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds.One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).

• A unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second.

• A degree on the centigrade scale of temperature.

• The speed at which light travels in a vacuum; the constancy and universality of the speed Of Light is recognized by defining it to be exactly 299,792,458 meters per second.Shorthand for cytosine or cysteine.