< b>G: G stands for guanine, one member of the base pair G-C (guanine-cytosine)
in the DNA. The other base pair in the DNA is A-T (adenine-thymine).
Each base pair forms a "rung of the DNA ladder." A DNA nucleotide is made of
a molecule of sugar, a molecule of phosphoric acid, and a molecule called a base.
The bases are the "letters" that spell out the genetic code. In DNA, the code letters
are A, T, G, and C, which stand for the chemicals adenine, thymine, guanine, and
cytosine, respectively. In base pairing, adenine always pairs with thymine, and
guanine always pairs with cytosine.
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