The term 'BASIC AMINO ACID' refers to one of the 20 amino acids that are the building blocks of proteins. Lysine is one of these basic amino acids, and it is represented by the 6-letter word 'LYSINE'. Lysine is an essential amino acid, meaning that it cannot be produced by the body and must be obtained through diet. It plays a role in the production of hormones, enzymes, and antibodies, and is important for growth and development.