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

83. The specific nitrogenous base that is exclusively found in DNA molecules but is missing from mature RNA molecules is

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

📝 Explanation

Thymine is a pyrimidine base specific to DNA, whereas RNA uses uracil as the complementary partner for adenine.

📖 Additional Information

  • Uracil
  • Thymine
  • Adenine
  • Cytosine

Thymine is a pyrimidine base specific to DNA, whereas RNA uses uracil as the complementary partner for adenine.

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