Question

Which of the following statements about amino acids is incorrect?

• A. Essential amino acids are not synthesised in the body, therefore have to be provided in the diet
• B. Leucine, isoleucine, lysine, valineare essential amino acids
• C. Cysteine and methionine are sulphur containing amino acids
• D. Lysine and arginine are acidic amino acids

Answer 1

Answer: (D)

Acidic amino acids have an extra carboxylic group (mono-amino dicarboxylic), e.g., glutamate (glutamic acid or Glu), asparate (aspartic acid or Asp).
Basic amino acids have an additional amino group without forming amides (diamino monocarboxylic), e.g., arginine (Arg), lysine (Lys).