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Acacia's Revise Series: Biology
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220415.Dxr
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00009_Field_9.txt
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1996-09-25
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DNA has a double helical structure with the backbone of each helix being
made up of pentose sugars alternating with phosphates. Inside the chains,
and bonded to each sugar is one of 4 'bases' (cytosine, guanine, adenine,
or thymine) with the bases on the two chains attract to one another by
hydrogen bonds in a a very specific way - adenine always pairs with
thymine and cytosine always pairs with guanine.