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Unformatted text preview: charge. Only molecules with multiple charged groups with different pKas will have a PI. Uncharged molecules or those with only one or one type of ionizable group will not have a unique pI. 5. List four categories of amino acids and provide one example for each class. (8 points) hydrophobic/aliphatic/non-polar: A, I, L, V, M aromatic: Y, F, T negatively charged: E, D positively charged: K, R, H polar, uncharged: S, T, C, N, Q 6. Which amino acid is not chiral? Why not? (2 points) Glycine is not chiral because it is not bound to four different groups....
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- Winter '10