Question

what is plasma membrane mad up of? why is the plasma membrane called a selectivity permeable membrane?

Answer 1

plasma membrane is made up of
cellulose

Answer 2

The plasma membrane is made up of a phospholipid bilayer that is arranged in a way that not all molecules can freely diffuse in and out of the cell. ... This is the reason it's called selectively permeable, as it is only permeable (allows things in and out) to select molecules.