Q. Lysine and tryptophan are

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Solution:

Lysine and tryptophan are essential amino acids. The essential amino acids are those which are not synthesised by our body and necessary ta take up from the regular diet.
Non essential amino acids are those which are synthesised in our body.
Aromatic amino acids are those which contains an aromatic rind structure i.e; phenyl group attached to the amino acid chain.
Proteins are the nitrogenous organic compounds composed of long chain of amino acids.