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The sugar in RNA is ribose, whereas the sugar in DNA is deoxyribose. The only difference between the two is that in deoxyribose, there is an oxygen missing from the 2' carbon â¦ (there is a H there instead of an OH).
The sugar-phosphate supporting structure of the DNA double helix is  called the backbone. This is why the DNA is commonly referred to as  a double helix.1 person found this useful.he sugar-phosphate supporting structure of the DNA double helix is  called the backbone. This is why the DNA is commonly referred to as  a double helix. 1 person found this useful.