1. Indicate which category (polar, non polar, acidic, or basic) each amino acid belongsto. a. Isoleucine b. Arginine c. Cysteine d. methionine e. Glycine f. glutamine 2. Draw Tyrosine at a pH of 12 and determine its charge. 3. Calculate the pl for Cysteine. 4. Where along the backbone of a polypeptide chain would you find free rotation? And where would rotation be restricted? 5. Calculate the charge on the following tetrapeptide at a pH of 7: Glu-His-Arg-Ala 6. For the following types of protein structure, explain the structure and indicate what type of bonds hold the structure together. a. Primary structure b. Secondary structure c. Tertiary structure d. Quaternary structure