BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The 20 to 22 amino acids that comprise proteins include: Alanine. Arginine. Asparagine.

Detailed explanation-2: -Both animal and plant proteins are made up of about 20 common amino acids.

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: -All the proteins including the eukaryotic and prokaryotic proteins are made up of 20 amino acids. In nature, there are only 20 amino acids are present which combine together differently to form all the protein. Hence, “all proteins are formed from 20 amino acids” is the correct answer.

Detailed explanation-5: -Throughout known life, there are 22 genetically encoded (proteinogenic) amino acids, 20 in the standard genetic code and an additional 2 (selenocysteine and pyrrolysine) that can be incorporated by special translation mechanisms.