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How are simple diffusion and facilitated diffusion similar? How are they different?

How is facilitated diffusion similar to diffusion through ion channels?

  • Answer:

    It's diffusion moving with the concentration gradient. It moves through the membrane but must be assisted by a carrier protein. It's still passive transport and doesn't require cellular energy. Glucose is a good example of a molecule that enters the cell by facilitated diffusion.

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Ion channels include open protein channels that can allow as many ions to pass through whereas in facilitated diffusion the transported solute needs to bind to a binding site to be transported onto the other side of the membrane. Both are similar on being chemical specific as in ion channels, channels specific to sodium won't allow potassium or molecules other than sodium to pass through.Similarly in facilitated transport, transporter which transports glucose wouldn't allow any other molecule than glucose to be transported from that particular binding site for glucose.Also both the transport medium involves membrane proteins.

ricka g

because the ion channels are working as a fascilitator for the ion.

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