Question

The main difference(s) between facilitated diffusion and active transport is (are)
A. facilitated diffusion moves substances down their concentration gradient and active transport moves them against their gradient.
B. facilitated diffusion does not rely on cellular energy and active transport does.
C. facilitated diffusion uses channel or carrier proteins and active transport does not.
D. A and B only
E. A, B, and C

Answer 1

facilitated diffusion requires channels and proteins. diffusion does not. @maria403 i dont why you mentioned active transport. fac. diffusion and diffusion are not active transports. they are passive. It is A and B. you can use proteins and channels using ATP, such as the Sodium Potassium NaK pump

Answer 2

.Transport of solutes across cell membranes by protein carriers can occur in one of two ways:
• The solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. This process is called passive transport or facilitated diffusion, and does not require energy.

• The solute can move "uphill," from regions of lower to higher concentration. This process is called active transport, and requires some form of chemical energy.

The transport process a cell uses depends on its specific needs. For example, red blood cells rely on facilitated diffusion to move glucose across membranes, whereas intestinal epithelial cells use active transport to take in glucose from the gut. Facilitated diffusion is effective for red blood cells because the concentration of glucose in the blood is stable and higher than the cellular concentration. On the other hand, active transport is needed in the gut because there are large fluctuations of glucose concentration as a result of eating.

http://www.phschool.com/science/biology_place/biocoach/biomembrane1/diffusion.html