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What are two characteristics of DNA?
O Double bonded with hydrogen
O Organic and saturated
O Helix and double stranded
Phosphate and nitrogenous
DNA has three types of chemical component: phosphate, a sugar called deoxyribose, and four nitrogenous bases—adenine, guanine, cytosine, and thymine. Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine.
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