Isoleucine, leucine, and lysine are three examples of amino acids that the body can not make in sufficient quantity. How are these compounds classified

Isoleucine, leucine and lysine are essential amino acids.

Explanation:

The amino acids are classified based on different criteria like

a) Polarity

b) acidc, basic or neutral behavior

c) aromatic or non aromatic

One important classification is that amino acids can be "essential" or "non essential".

Essential amino acids are those which cannot be made by our body and thus are required in our diet.

Non essential amino acids are those which our body can synthesize. So are not required in our diet.

So Isoleucine, leucine and lysine are essential amino acids.