Among the following bases, which one is not present in nucleotides?
Correct answer: D. Thyroxine
- A. Guanine
- B. Thymine
- C. Adenine
- D. Thyroxine
Explanation
The five common nitrogenous bases found in nucleotides are adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U). Thyroxine is a hormone derived from the amino acid tyrosine, not a nitrogenous base used in nucleic acids.
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