Lecture 3 DQ Membrane Dynamics

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Q 1.Briefly explain the difference between carrier proteins and channel proteins . 2. Carrier and channel proteins are specific .What does this mean? 3. Why does heat increase the rate of diffusion? 4. What is the difference between facilitated diffusion and active transport. 5. What is secondary active transport and what is advantageous about it?

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1. Carrier proteins refers to the transport proteins which binds to the molecules and allow the larger or polar molecules to pass through the membrane. Carrier proteins helps in the binding of specific solutes and transfers them across the bilayer by making conformational changes. Carrier proteins do not form channels. Channel proteins allows and facilitate the transport of substances across the cell membrane . Channel proteins follow channels and allows water molecules to flow through it and helps in transportation of substances.

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