alleryWhich base occurs in RNA but not in DNA?
AUracil
BGuanine
CAdenine
DCytosine
Answer & Solution
Correct answer: A. Uracil
1. Three of the four bases are shared by both.
2. DNA has thymine as its fourth base.
3. RNA carries uracil in its place.
_Source: syllabus Chemistry Part 2, Unit 10 'Biomolecules'_
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