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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

13. The nitrogenous bases that possess a single-ring structure and are classified as pyrimidines in DNA are

A. Adenine and Guanine
B. Cytosine and Thymine
✓
C. Thymine and Uracil
D. Adenine and Cytosine

📝 Explanation

Cytosine and thymine are single-ring pyrimidines, whereas adenine and guanine are double-ring purines.

📖 Additional Information

  • Adenine and Guanine
  • Cytosine and Thymine
  • Thymine and Uracil
  • Adenine and Cytosine

Cytosine and thymine are single-ring pyrimidines, whereas adenine and guanine are double-ring purines.

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