There are multiple ways that particles may cross a cellular membrane. Discuss the salient features of passive diffusion, facilitated diffusion, and active transport
What will be an ideal response?
Answer: Passive diffusion implies that no aid is given by a protein; therefore, only molecules that are lipid soluble can cross. Passive diffusion also does not require direct energy input, so substances can move only from areas of high to low concentration. Facilitated diffusion has the same energy parameters as simple diffusion, but utilizes a protein to enable charged molecules to cross the lipid membrane. Active transport requires that molecules or ions bind to the protein and that energy will be utilized. Because energy is consumed in this type of transport, it can be used to generate gradients (i.e., "uphill" transport).
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