Which of the following is false:
1 - Proteins are digested by the human body into individual amino acids.
2- Amino acids are used to synthesize proteins for growth and repair of tissue.
3- The body can synthesize all nine amino acids necessary for protein synthesis (The essential amino acids).
4-  Essential amino acids include: isoleucine, lysine, phenylalanine, tryptophan, leucine, methionine, threonine, valine.