Question

what is integral protein​

Answer 1

An integral protein is a protein in a membrane that is permanently attached to the membrane and spans the membrane, making contact with the hydrophobic portions of the membrane.

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Answer 2

An integral membrane protein is a type of membrane protein that is permanently attached to the biological membrane. All transmembrane proteins are IMPs, but not all IMPs are transmembrane proteins. IMPs comprise a significant fraction of the proteins encoded in an organism's genome.