Which one of the following amino acids is basic in nature?
Correct answer: C. lysine
- A. glycine
- B. alanine
- C. lysine
- D. glutamic acid
Explanation
Lysine is a basic amino acid. It has a side chain with an amino group (-NH2) which can accept a proton (H+) and make the amino acid basic in nature. Lysine has a positively charged amino group at physiological pH, which contributes to its basicity. Therefore, lysine is the basic amino acid.
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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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