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Write the main structural difference between DNA and RNA. Of the two bases, thymine and uracil, which one is present in DNA?

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                                         Structural difference

DNA RNA
1. The sugar present in DNA is 2-deoxyD-(–)-ribose 1. The sugar present in RNA is D-(–)ribose.
2. DNA has double stranded a-helix structure. 2. RNA has single stranded a-helix structure
3. DNA contains cytosine and thymine as pyrimidine bases. 3. RNA contains cytosine and uracil as pyrimidine bases.
4. DNA molecules are very large and their molecular mass may vary from 6x106-16x106 u. 4. RNA molecules are much smaller and their molecular may vary from 20,000–40,000 u.

Thymine is present in DNA.

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