Which one of the following bases is NOT present in RNA?
Correct answer: C. Thyamine
- A. Cytosine
- B. Adenine
- C. Thyamine
- D. Guanine
Explanation
The base "Thymine" (T) is not present in RNA. Instead, RNA contains the base "Uracil" (U). Thyamine is a nucleotide base found in DNA but not in RNA. In DNA, thymine pairs with adenine through two hydrogen bonds, forming a T-A base pair.
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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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