5. Refer to Exhibit A. The pI of an amino acid is the pH at which it has a zero net charge. What is the increasing order of isoelectric points (low pH to high) for these three amino acids? (A) ALA, HIS, ASP (B) ASP, ALA, HIS (C) HIS, ALA, ASP (D) ALA, ASL, HIS (E) ASP, HIS, ALA

3. In the sodium-potassium pump (A) sodium is transported out of the cell and potassium into the cell, both against concentration gradients (B) sodium is transported into the cell and potassium out of the cell, both against concentration gradients (C) sodium is transported out of the cell and potassium into the cell, both in the same direction as concentration gradients (D) sodium and potassium are both transported out of the cell against concentration gradients

5. Refer to Exhibit A. The pI of an amino acid is the pH at which it has a zero net charge. What is the increasing order of isoelectric points (low pH to high) for these three amino acids?
(A) ALA, HIS, ASP
(B) ASP, ALA, HIS
(C) HIS, ALA, ASP
(D) ALA, ASL, HIS
(E) ASP, HIS, ALA

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