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Unformatted text preview: Ch 2: Cells Cells- the basic, living, structural and functional units of the body The 3 main parts of a cell Name: Structure: Function: The cell’s flexible outer surface Regulates the flow of materials into and out of a cell; allows communication between cells and their external environment All of the cellular contents between the plasma membrane and the nucleus Cytosol- fluid portion Organelles- found in the cytosol and each have a different function A large organelle with DNA found inside it Chromosomes found within the nucleus contain genes that control cellular structure and function PLASMA MEMBRANE The Plasma Membrane (matching) 1. Fluid mosaic model B 2. Proteins 3. Lipids a. Act as a barrier to the passage of certain substances into and out of the cell b. The arrangement of molecules within the membrane resembles a sea of lipids containing many types of proteins c. Act as “gatekeepers” to regulate the movement of other molecules and ions in and out of the cell Structure of a Membrane 1. Lipid bilayer- the main structure of the plasma membrane a. Two back to back layers made up of 3 different types of lipid molecules: a.i. a.ii. a.iii. 2. Two categories of proteins: a. _____________ proteins : extend into or through the lipid bilayer a.i. What are transmembrane proteins? b. integral proteins : not as firmly embedded into the membrane and are attached to membrane lipids or integral proteins Functions of Membrane Proteins (put the words in the correct blanks) • ion channels • carriers or transporters • receptors • enzymes • cell-identity markers • 1.1....
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This note was uploaded on 04/03/2012 for the course KIN 2500 taught by Professor Hargroder during the Spring '08 term at LSU.
- Spring '08