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biol Chapter Four ns

biol Chapter Four ns - September 12 Chapter Four Cell...

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September 12 Chapter Four: Cell Membrane – Structure and Function How is the Structure of a Membrane Related to Its Function? Membrane Function: 1) Selectively isolates the inside of the cell from the outside 2) Regulates exchange of substances in and out of the cell 3) Facilitates communication with other cells Phospholipids Review: Glycerol – three fatty acid tails Phospholipids: - polar group – glycerol – two fatty acid tails Fluid Mosaic Model of Membrane Structure: figure 4-1 Membrane Proteins: 1) Transport proteins: regulate movement through membrane Channel proteins Carrier proteins 2) Receptor Proteins: trigger cellular response when specific molecules attach 3) Recognition proteins: ID tags and attach sites Glycoprotein How Do Substances Move Across Membranes? Transport Processes: Passive transport : movement down conc gradient, no energy required Simple diffusion : goes across membrane without help Facilitate diffusion
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