A difference between the dialysis tubing used to in the lab

A difference between the dialysis tubing used to in the lab to simulate a restrictivebarrier and the phospholipid bilayers that surround living cells is: a) The phospholipid bilayer restricts movement of ions and molecules based exclusively on their size. b) The dialysis tubing restricts movement of ions and molecules based exclusively on their relative polarities. c) The phospholipid bilayer restricts movement of ions and molecules based exclusively on their relative polarities. d) The dialysis tubing restricts movement of ions and molecules based exclusively on their size. e) None of the above

Solution

Dialysis tubing - permeable but on the basis of pore size.

Small molecules pass through by the process of osmosis whereas large molecules cannot.

Plasma membrane - both active and passive transport occr through it. It posseses carrier proteins which help molecules pass through and contains hydrophobic ends which remain embedded in the membrane and hydrophilic ends which remains on the both ends of the memebrane. All these help the molecules to pass through the membrane and these carrier proteins also assist the molecule.

Dialysis tube - use the process of diffusion based on pore size and is a simple process.

Plasma membrane - both active and passive transport and is a complex process.