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G = guanine, a purine base in DNA.

A = adenine, a purine base in DNA

C = cytosine, a pyrimidine base in DNA

T = thymine, a pyrimidine base in DNA

DNA is a double helix and the two strands are held together by hydrogen bonds between A & T (2 bonds) and G & C (3 bonds).

The 'rung steps' are either an A & T or a G & C.

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13y ago

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