3.16 a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T) and the cytosine (C) with guanine (G)
the two strands of helixes are called the ‘sugar-phosphate backbone’ they are linked together by pairs of four different types of bases (two pairs).
the order of the bases on one side of the double helix, are what is called the gene.
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