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Which of these is a substituted purine?

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in Biology – Class 11 by (272k points)
Which of these is a substituted purine?

(a) Cytosine

(b) Thymine

(c) Uracil

(d) Guanine

This question was posed to me in a national level competition.

My question comes from Biomolecules topic in chapter Biomolecules of Biology – Class 11

1 Answer

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Correct choice is (d) Guanine

To explain: Adenine and guanine are the substituted purines. The substituted pyrimidines are cytosine, thymine and uracil. They are the nitrogenous bases present in nucleic acids along with pentose sugar and phosphate group.

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