BSC 1010 Chapter Notes - Chapter 4: Endoplasmic Reticulum, Nuclear Membrane, Cell Membrane
2 Feb 2017
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Cell theory: all organisms are composed of one or more cells, cells only arise by division of preexisting cells. Surface area-to-volume ratio: as cells size increases, its volume increases much faster than the surface area. Chapter 4: cell structure size is constrained by the diffusion distance cell surface provides the only opportunity for interaction with the environment as size increases, diffusion become inefficient. Magnification gives better resolution than is possible with the naked eye resolution is the minimum distance two points can be apart and still be distinguished as two separate points first microscopes used glass lenses. Despite modifications, all cells resemble one another in certain fundamental ways. Makes them unable to adapt to changes in environmental temperatures bacteria: most are encased by a strong cell wall. Majority of membrane lipids are assembled here and then sent to where they need to go stores intracellular ca2+
