<prompt> Polar amino acids are all exceptGlutamic acidHistidineGlutamineMethionine  <response>: Amino acids having charged or ionic polar side chains hydrophilic: C-a. Acidic amino acids: They have a negative charge on the R group: Aspaic acid and Glutamic acid Tyrosine is mildly acidic. C-b. Basic amino acids: They have a positive charge on the R group: Lysine, Arginine, and Histidine.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 21 