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Unformatted text preview: o With adequate turgor pressure, vacuole pushes against cell walls, maintaining cell’s shape o In absence of water, cells collapse Active Transport o Cells need to move some substances against concentration gradients o Requires ATP (energy) to do so o Membrane proteins move molecules across using ATP o Endocytosis o Moving things into a cell (water, minerals, energy) o Exocytosis o Moving things out of a cell (waste, hormones, etc) Cell Size and Shape o As a cell grows, it has less membrane to engage in less cellular activity o Specialized Jucnitons o Desmosomes attach cells together o Tight junctions make cell attachments leak proof o Gap junctions (animals)...
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- Spring '07
- Vacuole, free water molecules, fresh water protists