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asciandwildlifebio
asciandwildlifebio, Graduate Student
Category: Homework
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Experience:  M.S. Bio, B.S. in Animal Science and Wildlife Biology. Comprehensive Spanish Written and Oral Skills
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Because materials move from high concentration to low ...

Resolved Question:

Because materials move from high concentration to low concentration by simple diffusion, and they move the same way by facilitated diffusion, why do cells make proteins to carry out facilitated diffusion? Isn't this just a waste of energy? Explain
Submitted: 9 years ago.
Category: Homework
Expert:  asciandwildlifebio replied 9 years ago.

Cell make proteins to carry out facilitated diffusion because the proteins will only allow specific materials to crossover. The plasma membrane is made up of protein and a lipids bilayer. The lipid bilayer is impermeable to glucose, sodium ions, and chloride ions. These must be "facilitated" by proteins that spread across the entire membrane and provide an alternative pathway. This facilitation is called facilitated diffusion and is not a waste of energy because it allows specific ions to pass over which could not do so otherwise.

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Customer: replied 9 years ago.
Reply to asciandwildlifebio's Post: I need a little more thorough and in depth explaination of this please.
Expert:  asciandwildlifebio replied 9 years ago.

Facilitated diffusion has two components to take into consideration. First carrier proteins must bond to a molecule on one side of the membrane, travel across, and then release it on the other side, and secondly carrier proteins usually bond with a specific molecule, like an enzyme bonds to a specific substrate. These substrates can be the ions mentioned below.

Cell make proteins to carry out facilitated diffusion because the proteins will only allow specific materials to crossover. The plasma membrane is made up of protein and a lipids bilayer. The lipid bilayer is impermeable to glucose, sodium ions, and chloride ions. These must be "facilitated" by proteins that spread across the entire membrane and provide an alternative pathway. This facilitation is called facilitated diffusion and is not a waste of energy because it allows specific ions to pass over which could not do so otherwise.

To learn more about facilitated diffusion of ions, and specific gated channels, here is a good resource. Just follow the link, and look for the Facilitated Diffusion of Ions subtopic.

Expert:  asciandwildlifebio replied 9 years ago.
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