LIFE SCIENCE

Detailed explanation-1: -Of these 20 amino acids, nine amino acids are essential: Phenylalanine. Valine. Tryptophan.

Detailed explanation-2: -Six amino acids are non-essential (dispensable) in humans, meaning they can be synthesized in sufficient quantities in the body. These six are alanine, aspartic acid, asparagine, glutamic acid, serine, and selenocysteine (considered the 21st amino acid).

Detailed explanation-3: -The essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The nonessential amino acids are alanine, asparagine, aspartic acid, glutamic acid, and serine.

Detailed explanation-4: -Both animal and plant proteins are made up of about 20 common amino acids. The proportion of these amino acids varies as a characteristic of a given protein, but all food proteins-with the exception of gelatin-contain some of each.