- A Adenine
- B Guanine
- C Cytosine
- D Uracil
Correct answer: D. Uracil
Explanation: RNA contains Uracil instead of Thymine. Uracil pairs with Adenine. The lack of a methyl group makes it slightly less stable.
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.