18.The anaerobic conversion of 1 mol of glucose to 2 mol of lactate by fermentation is accompanied by anet gain of:(A)1 mol of ATP.(B)1 mol of NADH.(C)2 mol of ATP.(D)2 mol of NADH.(E) none of the above.

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.

18.The anaerobic conversion of 1 mol of glucose to 2 mol of lactate by fermentation is accompanied by a
net gain of:
(A)1 mol of ATP.
(B)1 mol of NADH.
(C)2 mol of ATP.
(D)2 mol of NADH.

(E) none of the above.

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