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Figure 1 <br />Figure 1. DNA. Nucleotides in one strand are paired with nucleotides in the opposite strand. Adenine (A) <br />pairs only with thymine (T), and cytosine (C) pairs only with guanine (G). Together, the two strands form a <br />double helix. During replication the strands unwind, and serve as templates for the synthesis of two new <br />DNA molecules. (From Strickberger 1976.) <br />6