why does presence of thymine instead of uracil gives additional stability to DNA?

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Solution

Thymine is more stable than uracil that is why it is present in DNA. Since DNA has to be stable and RNA tends to be unstable, to accomplish these things thymine is a component of DNA to make it a little more stable while uracil is present in RNA to add to its instability.

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how does CH3 group in thymine facilitated its presence in DNA (or) why is thymine present in DNA instead of uracil.

Which of the following bases is not present in DNA?
(a) Adenine (b) Thymine (c) Cytosine (d) Uracil

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