Final answer:
RNA uses uracil as a replacement for thymine as one of its nitrogenous bases.
Explanation:
In RNA, the nitrogenous bases vary slightly from those of DNA. Adenine (A), guanine (G), and cytosine (C) are present, but instead of thymine (T), a pyrimidine called uracil (U) pairs with adenine.
Learn more about RNA nitrogenous bases here:
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