Home › MCQs › MBBS › Question #10312
Back to Questions
MBBS QUESTION #10312
Question 1
Which pyrimidine base is found in DNA but is replaced by a different pyrimidine (uracil) in RNA?
  • Cytosine
  • Thymine✔️
  • Uracil
  • Adenine (a purine, not a pyrimidine)
Correct Answer Explanation
Thymine (5-methyluracil) is unique to DNA, while RNA substitutes uracil in its place; cytosine is common to both nucleic acids.