The corrects answers are: Thr and Asn are polar amino acids. Isoleucine has more than one stereocenter (chiral center) The Leu side chain does not from hydrogen bonds with other amino acids Solution The corrects answers are: Thr and Asn are polar amino acids. Isoleucine has more than one stereocenter (chiral center) The Leu side chain does not from hydrogen bonds with other amino acids.