BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Essential amino acids cannot be made by the body. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

Detailed explanation-2: -The best sources of amino acids are found in animal proteins such as beef, poultry and eggs. Animal proteins are the most easily absorbed and used by your body. Foods that contain all nine essential amino acids are called complete proteins.

Detailed explanation-3: -The bloodstream provides a readily available pool of amino acids, which can be taken up by all cells of the body to support the myriad of biochemical reactions that are essential for life.

Detailed explanation-4: -Because of particular structural features, essential amino acids cannot be synthesized by mammalian enzymes (Reeds 2000). Nonessential amino acids, therefore, can be synthesized by nearly all organisms.