How does the pyrimidine composition change between DNA and RNA?

DNA is mostly made up of pyrimidines

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DNA has Thymine and RNA has Uracil

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DNA has Uracil and RNA has Thymine

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None of the above

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Solution

The correct option is B
DNA has Thymine and RNA has Uracil

There are three types of pyrimidines - Cytosine, Thymine, and Uracil. DNA has Cytosine and Thymine, while RNA has Cytosine and Uracil.

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\begin{matrix} C o l u m n - I & C o l u m n - I I p . S u g a r i n D N A & i . A d e n i n e, G u a n i n e q . P u r i n e s & i i . R i b o s e r . S u g a r i n R N A & i i i . D e o x y r i b o s e s . P y r i m i d i n e s & i v . C y t o s i n e, T h y m i n e, U r a c i l \end{matrix}

DNA and RNA contain four bases each. Which of the following bases is not present in RNA?
(a) Adenine (b) Uracil (c) Thymine (d) Cytosine

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