Define the terms diffusion, passive transport,
active transport, and osmosis. In each of your
definitions, describe the role of a concentration
gradient.
Biological membranes are said to be selectively
permeable (or semi-permeable). What does this term mean, and how
does this affect the way that molecules are able to move through
cellular membranes?
Which type of molecule is more likely to quickly pass through a
cellular membrane via simple diffusion, polar or non- polar?
Why?