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IB Biology Exam Prep

Category - Biology

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Which of the following bases is not used in RNA?

Thymine
Uracil
Guanine
Cytosine
Adenine

Explanation

Answer: A, Thymine. RNA does not use thymine as one of its nitrogenous bases.

Key Takeaway: In DNA, the four nitrogenous bases are adenine, thymine, cytosine, and guanine. In RNA, the four nitrogenous bases are adenine, uracil, cytosine, and guanine.

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