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Cellular Diffusion
Part 1 of Paper
.... world, but is also vital in the transfer of particles in and out of the cell. The cell membrane controls which particles can enter, and which particles can not, because it is selectively permeable. The membrane is made up of a bi-layer of lipid molecules, which have very small spaces between each other, and if a parti.... Part 2 of Paper
....mosis is very similar to diffusion, however it involves the concentration of water. Osmosis, like diffusion, is a passive process, and does not require energy to occur. Active transport does require energy though, as it involves movement up the concentration gradient. This involves protein carrier molecules binding to the substance and moving it into or out of the cell, against the concentration gradient.
If a large molecule needs to be moved in or out of the cell, then two other processes, end.... |
| Number of words: 595 - Approximate pages: 3 |
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