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Which is not a chemical difference between RNA and DNA?

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DNA and RNA have different types of pentose sugars

Purines and pyrimidines usually exist in 1:1 ratio in DNA but not in RNA

DNA has Thymine and RNA has Uracil

DNA has only purines and RNA has only pyrimidines.

answer is D.

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Detailed Solution

Both DNA and RNA have purines and pyrimidines. DNA and RNA have purines Adenine and Guanine and pyrimidine Cytosine. Thymine is present in DNA and it is substituted by Uracil in RNA.

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