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yes, transmembrane proteins have both polar and non-polar regions. This is because these proteins are dispersed through the membrane almost like pieces of stones. So, to be inside the hydrophobic region of the phospholipid bi-layer AND also outside of it in the water or aqueous solution they transmembrane protein needs to be amphipathic.

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What classification of transmembrane protein do channel proteins belong to?

Channel proteins belong to the classification of transmembrane proteins known as integral membrane proteins.


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