Choose the correct answer from the alternatives given:
Which one of the following is not a pyrimidine base?

Thymine

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Guanine

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Cytosine

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Uracil

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Solution

The correct option is B Guanine
Nucleic acids mainly contain two types of bases: purines and pyrimidines.
Purines are adenine and guanine whereas pyrimidine is cytosine, thymine and uracil. DNA is composed of adenine, guanine, cytosine and thymine. RNA is composed of adenine, guanine, cytosine and uracil.
Hence, the correct answer is 'Guanine'

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