Cell Membranes - hole through which the molecule can enter or exit a cell Channel proteins do not require the binding of a molecule and

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Cell Membranes Problems Problem : Why is it necessary for cell membranes to have proteins that help transport molecules? Solution for Problem 1 >> The cell membrane is composed of a lipid bilayer that is highly impermeable to most molecules. As a result, outside structures are required to help transport essential large, polar molecules across the cell membrane. Problem : What is the name of the natural process by which molecules flow from an area of higher concentration to one of lower concentration? Solution for Problem 2 >> Diffusion. Problem : What is the difference between the behavior of carrier and channel proteins? Solution for Problem 3 >> Carrier proteins allow specific molecules to cross the cell membrane by undergoing a conformational change upon the binding of the molecule. The conformational change opens a
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Unformatted text preview: hole through which the molecule can enter or exit a cell. Channel proteins do not require the binding of a molecule and conformational change to open. Channel proteins allow molecules to steadily diffuse across the membrane through diffusion. Problem : What is the function of an ionophore? Solution for Problem 4 >> Ionophores function to increase a membrane's permeability to a specific ion thereby facilitating its movement across that cell's membrane. Problem : Name two specific functions of membrane transport. Solution for Problem 5 >> Membrane transport helps maintain the proper distribution of ions across a cell membrane; helps maintain proper cellular pH, and helps mediate communication between cells in multi-cellular organisms....
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This note was uploaded on 01/24/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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