Which of the following statements describes integral membrane proteins?
I. They protect the contents of the cell from chaotropic agents such as urea.
II. They are easily dissociated from the membrane by changes in pH or high salt concentration.
III. They are held tightly in place by hydrophobic effects between the membrane and hydrophobic amino acids.
A) I, II, III
B) I, III
C) I
D) II
E) III
Answer: E) III
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