Ch 5 membranes student lecture

Ch 5 membranes student lecture - Ch. 5 Cellular Membranes...

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Ch. 5 Cellular Membranes Membrane Composition and Structure 0. Cell membranes are ______________________ , dynamic structures that: 0. Perform vital ______________________ roles 1. Form ______________________ between cells and their environments 2. Regulate ______________________ of molecules into and out of cells 1. Lipids, proteins, and carbohydrates in ______________________ combinations make these tasks possible. 3. The lipid portion of a cellular membrane provides a barrier for ______________________ molecules. 4. Membranes are dynamic and proteins “______________________ within them. This general design is called the ______________________ . 5. Most of the lipid molecules found in biological membranes are ______________________ . 0. Each has a ______________________ region, where the ______________________ groups are located, and a ______________________ region, the ______________________ (amphipathic). 1. The phospholipids organize themselves into a ______________________ . 2. The ______________________ of the membrane is ______________________ , which allows some molecules to ______________________ ______________________ in the membrane. 0. Its is extremely ______________________ for a molecule to ______________________ from one side of the membrane to the other 3. Although all biological membranes are structurally similar, some have quite ______________________ of lipids and proteins. 4. Membrane fluidity is important because it affects ______________________ . 1. Cholesterol may increase or decrease ______________________ depending on other factors. 0. Cholesterol ______________________ fluidity @ ______________________ by restraining mvmt 1. Cholesterol ______________________ fluidity @ ______________________ by preventing packing
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2. For any given membrane, fluidity also ______________________ with ______________________ temperature. 3. Fatty acid composition can also influences membrane fluidity. 2. Fluidity ______________________ with ______________________ fatty acid composition 3. Fluidity ______________________ with ______________________ fatty acid composition 4. In winter, plants (that can’t regulate temp.) ______________________ fatty acid composition in membranes 0. All biological membranes contain proteins. 0. The ____________________________________________ molec ules varies depending on membrane function. 1. Many membrane proteins have ____________________________________________ region s. 2. The association of protein molecules with lipid molecules is not ______________________ ; both are free to move around laterally, according to the fluid mosaic model. 5. There are different types of membrane proteins. 4. ______________________ membrane proteins have ______________________ regions of amino acids that penetrate or ______________________ the phospholipid bilayer. 5.
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This note was uploaded on 04/19/2008 for the course PCB 3023 taught by Professor Sikorski during the Fall '07 term at University of South Florida.

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Ch 5 membranes student lecture - Ch. 5 Cellular Membranes...

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