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Which nitrogenous base is found in mRNA but not in DNA?
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7. DNA and Chromosome Structure
RNA
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Unlike DNA, RNA contains the nitrogenous base:
A
adenine
B
thymine
C
uracil
D
guanine
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Understand that DNA and RNA are both nucleic acids but differ in their nitrogenous bases.
Recall that DNA contains the bases adenine (A), thymine (T), cytosine (C), and guanine (G).
Recall that RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G), where uracil replaces thymine.
Recognize that the key difference in nitrogenous bases between DNA and RNA is that RNA has uracil instead of thymine.
Therefore, the nitrogenous base found in RNA but not in DNA is uracil.
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