For questions 82 through 87, answer only THREE of the four questions. (45 points total, 15 points each question).  If more than three questions are answered, indicate the three you wish to have graded.  If there is no indication, the first three answers will be graded.

Within a bilayer, lipid molecules rarely rotate about their long axis, but diffuse laterally at very high rates.

PSC-833 inhibits P-glycoprotein.

Which of these statements is incorrect according to Rutherford’s model of the atom?

a lower temperature.

Questions 77-81 Membrane electrochemical gradients

a thermophilic bacterium.

are only important in active transport of solutes across membranes.

only α helices

a greater proportion of saturated phospholipids.