Honors Biology Ch. 5 Class Notes

Honors Biology Ch. 5 Class Notes - Honors Biology, Period 5...

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Honors Biology, Period 5 Chapter 5 Notes Section 5.10 A.) selective permeability – allows some substances to cross more easily than others Section 5.11 A.) Phospholipids are the main components of membranes head B.) amphipathic – a term that describes a molecule that is both polar and nonpolar Section 5.12 A.) phospholipid bilayer – as a result of their amphipathic nature, phospholipids form a bilayer (a two-layer sheet) polar nonpolar saturated unsaturated Fatty acids (can be sat+sat, unsat+sat, or unsat+unsat - will dissolve in water - hydrophilic - phosphate group P O O O O Hydrophilic heads water Hydrophobic tails hydrophobic
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*figure 5.12 label for test B.) Why are membranes selectively permeable? 1. They are hydrophobic 2. Hydrophilic molecules can’t move across (like dissolves) C.) Fluid Mosaic Model 1. mosaic – the membrane has such a diverse collection of proteins embedded in the bilayer (figure 5.12) 2. fluid – the individual molecules can drift laterally D.) What influences fluidity? 1. manipulating the types of fatty acids in their phospholipids (plants) 2. add or remove cholesterol (animals) E.) The Surface of the Plasma Membrane Key molecules: 1. glycoprotein 2. glycolipids a. The oligosaccharide chains are specific to the individual - purpose: self recognition - cells can decide which cells are their own vs. intruder
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Honors Biology Ch. 5 Class Notes - Honors Biology, Period 5...

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