Answer:
Nutrient composed of a central carbon bonded to an positively charged amino group (-NH2) and a negatively charged Carboxyl (-COOH). It contains a side chain R-Group which is what distinguishes the amino acid from others.
Histidine
Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan
Valine