NEET 2020 · ChemistryAmino acidsPrevious Year Question
Which of the following is a basic amino acid?
Answer: (B) Lysine. \textbf{Answer:} (B) Lysine has an extra basic group in its side chain.
- A.Tyrosine
- B.Lysine✓
- C.Serine
- D.Alanine
Correct Answer
(B) Lysine
Solution & Explanation
\textbf{Answer:} (B) Lysine has an extra basic group in its side chain. \textbf{Solution:} Amino acids are classified as acidic, basic or neutral by the nature of their side chain. Lysine carries an additional basic group on its side chain (so it has two amino groups and one carboxyl group), making it a basic amino acid. Tyrosine (phenolic) and serine ( bearing) are neutral, and alanine is a neutral non-polar amino acid.
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