Question

question 3
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which of the following nitrogenous bases is contained within the structure of rna but not dna?
thymine
cytosine
uracil
adenine

Explanation:

DNA has nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G). RNA has adenine (A), uracil (U), cytosine (C), and guanine (G). So, uracil is in RNA but not in DNA.

Answer:

Uracil