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Nucleic Acids

Which of the ...

Question

Which of the following are purine bases?
(a) Guanine (b) Adenine (c) Thymine (d) Uracil

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Solution

Answers: (a), and (b)
Purines consist of six-membered and five-membered nitrogen-containing ring fused together.
Guanine and adenine are purine bases whose structures are

While thymine and uracil are pyrimidine bases.
Hence (a) and (b) are correct choices.

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Similar questions

Q. Which among the following are purine derivatives among the following bases?
1. Adenine 2.Uracil 3.Guanine 4.Thymine

Q. Assertion :Purine bases present in DNA are adenine and guanine. Reason: The base thymine is present in RNA while base uracil is present in DNA.

Q. Assertion :The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason: Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

Q. Nitrogenous base present in DNA are
(a) Thymine
(b) Cytosine
(c) Adenine
(d) Guanine

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