DNA is composed of two strands, each of which is composed of four nitrogenous bases: adenine (A), thymine (T), cytosine (C) and guanine (G). These four bases are linked together by hydrogen bonds and form a double helix. The two strands of the double helix are antiparallel, meaning that they run in opposite directions, with A-T and C-G base-pairing between the two strands.
0 More Answers