Question 1
Which molecules can move across the phospholipid bilayer by simple diffusion?
◦ steroids
◦ lipids
◦ water
◦ lipids and water
◦ All of the answers are correct.
Question 2
A cell that is permeable to Solute X is placed into solution containing a higher concentration of X. Diffusion occurs until equilibrium is reached. At this time,
◦ there is no further change in concentration of Solute X.
◦ there is no further movement of Solute X across the membrane.
◦ Both of the statements are correct.
◦ Neither of the statements is correct.