Question

Which of the following sets consists only of essential amino acid?

• A. Alanine, tyrosine, cystine
• B. Leucine, lysine, tryptophan
• C. Alanine, glutamine, lysine
• D. Leucine, proline, glycine

Answer 1

The correct option is B Leucine, lysine, tryptophan

An essential amino acids is an amino acid that cannot be synthesised by the organism being considered, a therefore must be supplied in its diet.
The ten amino acids human cannot synthesize are phenylalanine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, valine, arginine and histidine. So the correct answer is option b.