4.Which amino acid does not have a primary a-amino group?(A)glutamine(B)arginine(C)Iysine(D)proline(E) glutamate

7.The isoelectronic point of an amino acid is the point where (A)the pKa of the a-carboxylic acid is the same as the pK, of the a-amino group. (B)the a-carboxylic acid is protonated and the a-amino group is unprotonated. (C)the solubility of the amino acid is maximized. (D)the a-carboxylic acid and the a-amino group are both half protonated.(E)the amino acid carries no net electrical charge.

4.Which amino acid does not have a primary a-amino group?
(A)glutamine
(B)arginine
(C)Iysine
(D)proline

(E) glutamate

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