General Science • BiologyEasy
Which nitrogenous base is found exclusively in RNA molecules, replacing thymine which is found in DNA?
A. Adenine
B. Guanine
C. Uracil✓ Correct Answer
D. Cytosine
💡 Solution & Explanation
Uracil is a pyrimidine nitrogenous base found exclusively in ribonucleic acid, where it pairs with adenine during cellular transcription processes. In contrast, deoxyribonucleic acid contains thymine instead of uracil to maintain greater genetic stability. This subtle biochemical difference is fundamental for distinguishing between DNA and RNA structures.
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