1. Arginine has the following pke values (pki = 2.17. pka = 9.04, pke = 12.48), NH, CNH Chu Cha CH3CH C schehiques NH , , NH cm, quia NH wit, & in an, en, cn, qus NH NH NH , , , Chemi Corleon NH, CANH CH CH, CHC NH - , , chybu,hion NH NH a Give the letter corresponding to the structure of arginine at the following pH values I PH4 pH 7 PH 11 2. Consider the following biomolecule (CH. E a phenyl group) 8 NH" HC-NH-CH-C-NH4HC-" CHASH CH COH (a) What kind of biomolecule is it? -E-wego o (b) What is the name of it? (C) Give the three letter abbreviation based name of this (for example, Tyr is a three letter abbr (d) Which amino acids in the molecule above are polar 3. Indicate the level(s) of protein structure to which each of the following contributes (a) helix (b) I-borrel (c) hydrophobic interactions (d) subunits (a) Drow the soelectric structure and (o) calculate the isoelectric point for a particocid (Ap) (c) Circle terms applying to polar on polo acidic bas aromatic