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DNA is a long polymer with deoxyriboses and phosphate backbone.Having different nitrogenous bases :adenine, guanine , cytosine , and thymine. RNA is a polymer with ribose and phosphate backbone.Four different nitrogenous bases: adenine , guanine , cytosine , and uracil .
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DNA is double helix it is consist of 2 strands while RNA is single stranded. both contains N-bases which are ,guanine, cytosine, and  adenine. but they differ in one base thymine which is present in dna and uracil presnt in rna
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