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Q.

Which of the following bases is not common to DNA and RNA?

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a

Thymine

b

Cytosine

c

Guanine

d

Adenine

answer is C.

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Detailed Solution

Nitrogenous bases are ring-shaped compounds that include nitrogen.

Purines and pyrimidines are the two main categories of nitrogenous bases.

Adenine and guanine, two purines, are both found in DNA and RNA.

Thymine, uracil, and cytosine are the pyrimidine bases.

While RNA has uracil and cytosine, DNA has thymine and cytosine.

As a result, adenine, guanine, and cytosine are found in both DNA and RNA while thymine and uracil are absent from both.

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