Bio181FinalExamGuide4 - 7. Cellular Organization and...

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7. Cellular Organization and Operations; Enzymes and Energy. a. cellular components: - cell wall - a fairly rigid layer surrounding a cell located outside of the plasma membrane (also known, in some cases, as the cell membrane) that provides additional support and protection. - protoplast – total living contents of a cell - nucleus – comprehensive function is to regulate and control the cell. This includes regulating the differentiation of the ell, controlling the pattern of cell division, regulating cellular metabolism. - vacuole – find in eukaryotes, unicellular protests, contractile vacuole regulates H2O content, constant influx of water across cell membrane - cytoplasm – the entire volume of the protoplast, exclusive of the vacuole and nucleus b. cell membrane: - fluid mosaic – continuous lateral movement of phospholipids molecules - differential permeability – allows some things to move, others not - diffusion – passive movement of molecules from an area of higher concentration to an area of lower concentration. - osmosis - the net movement of water through a selective permeable membrane from a region of low solute potential to a region of high solute potential - facilitated diffusion - is a process of diffusion , a form of passive transport , where molecules diffuse across membranes , with the assistance of transport proteins . - permeases
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Bio181FinalExamGuide4 - 7. Cellular Organization and...

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