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4. In RNA, which base replaces thymine?

A. cytosine
B. uracil
C. guanine
D. adenine


Sagot :

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.


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