Which one of the following nitrogen bases is not present in DNA?
Correct answer: C. Uracil
- A. Adenine
- B. Guanine
- C. Uracil
- D. Cytosine
Explanation
Uracil is a nitrogen base present in RNA but not in DNA. In DNA, the nitrogen bases are adenine (A), guanine (G), cytosine (C), and thymine (T). Uracil replaces thymine in RNA.
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