NEET 2019 · BiologyNucleic acidsPrevious Year Question
Purines found both in DNA and RNA are
Answer: (B) Adenine and guanine. Answer: (B) Adenine and guanine.
- A.Adenine and thymine
- B.Adenine and guanine✓
- C.Guanine and cytosine
- D.Cytosine and thymine
Correct Answer
(B) Adenine and guanine
Solution & Explanation
Answer: (B) Adenine and guanine. Solution: Of the five nitrogen bases found in nucleic acids, the skeletal heterocyclic rings are of two kinds: purines and pyrimidines. NCERT explicitly states that adenine and guanine are substituted purines while cytosine, uracil and thymine are substituted pyrimidines. Adenine and guanine occur in both DNA and RNA, so the two purines common to both are adenine and guanine. NCERT Reference: Ch 9, p.111, line ~21 — "Adenine and Guanine are substituted purines while the rest are substituted pyrimidines."
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