Why plasma membrane called permeable as well as semipermeable?

1.	Why plasma membrane called permeable as well as semipermeable?
Answer» Plasma membrane allows the entry of some specific molecules which are insoluble in memb. with the help of intrinsic proteins which are recognized by the cell and those which are soluble in lipid part of memb. can pass directly into the cell through diffusion . So , it is semi-permeable memb.

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