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Unformatted text preview: paired with a "C" on the other. The two strands are held together by hydrogen bonds (electrostatic attraction). Two hydrogen bonds hold adenine to thymine. Three bonds attach cytosine to guanine as indicated in the diagram above. During the process of cell division, the DNA becomes tightly coiled, forming structures called chromosomes . The diagram below is a portion of a double-stranded chromosome showing the centromere and a portion of the base sequence. The diagram does not show the extensive looping and coiling and the proteins associated with coiling. Notice that the base sequence in the two chromatids is identical....
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