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Biology - Facilitated Diffusion

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Paige Bourbina

on 6 December 2012

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Transcript of Biology - Facilitated Diffusion

Paige Bourbina, Mara Shaw, and Kyle Freel Facilitated Diffusion What is Facilitated Diffusion? - A passive transport used for molecules that cannot readily diffuse through cell membranes, even when there is a concentration gradient across the membrane. What Does That Mean? Facilitated Diffusion is the process used for molecules that cannot separate cell membranes on command, even when there is a concentration slope across the membrane. What Are The Steps to Facilitated Diffusion? 1. A molecule bonds to a carrier protein* on one side of the cell membrane. 2. The carrier protein changes shape, shielding the molecule from the interior of the membrane.
3. The molecule is released on the other side of the membrane.
4. The carrier protein then returns to it's original shape. *Carrier Protein: A protein that transports substances across a cell membrane.* What Molecules Are Transported? The molecules being transported are only specific to carrier proteins. For example, a sugar molecule is transported by a sugar carrier protein. What Structures Are Involved? <> Molecule (Sugar or Lipid)
<> Carrier Protein
<> Cell Membrane Passive or Active Transport? Facilitated Diffusion uses passive transport. Facilitated Diffusion in Action http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter5/how_facilitated_diffusion_works.html What Is Passive Transport? Passive Transport is transportation that goes on without the use of energy. Like, if we were floating on top of a rapid moving river, it would be passive transport, because we are not using energy. Why do these molecules need carrier proteins? Molecules need carrier proteins because :
- They are too large to fit through the pores of a Cell Membrane
- They are insoluble in water (meaning that they cannot touch the Hydrophobic interior of the lipid bilayer. Faciliated Diffusion













What does a Sugar carrier transport?


A structure involved that the molecules are to big to fit through its pores.


What does the carrier protein change to accomidate the molecule?


Sugar or lipid.


What does the Carrier Protein return to after releasing the molecule?


What does a lipid carrier transport?



Process used for molecules that can't seperate cell membranes on command.


The part of the cell membrane that the carrier protein shields the molecule from.


Transports substances(molecules) across the cell membrane.


What transport does Faciliated diffusion use? http://www.crosswordpuzzlegames.com/cgi-crosswordpuzzlegames/create This is the puzzle link
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