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21 August, 12:47

Dna is sometimes described as a ladder-shaped molecule. what would be the best description of the composition of the rail portion that runs up each side of the ladder?

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  1. 21 August, 13:27
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    The sugars in the backbone

    The backbone of DNA is based on a repeated pattern of a sugar group and a phosphate group. The full name of DNA, deoxyribonucleic acid, gives you the name of the sugar present - deoxyribose.

    Deoxyribose is a modified form of another sugar called ribose. I'm going to give you the structure of that first, because you will need it later anyway. Ribose is the sugar in the backbone of RNA, ribonucleic acid.
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