2. Nucleotides in a DNA molecule are linked together through(A)glycosidic bonds.(B)amide linkages.(C)hydrogen bonds.(D)phosphoanhydride bonds.(E) phosphodiester bonds.

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.

2. Nucleotides in a DNA molecule are linked together through

(A)glycosidic bonds.

(B)amide linkages.

(C)hydrogen bonds.

(D)phosphoanhydride bonds.

(E) phosphodiester bonds.

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