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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About Macromolecules
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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