Trypsin Is a Hydrophilic Protease and Therefore Is Unable to Cross

Essay

Trypsin is a hydrophilic protease and therefore is unable to cross the plasma membrane and enter a cell.However,it is capable of digesting the hydrophilic portions of membrane proteins.As a result of these properties,researchers investigating membrane proteins have treated cells with trypsin then separated the proteins by SDS-PAGE to gain insight into the orientation of particular proteins within the membrane.Describe an experiment using this information and the results you would expect with the following types of membrane-associated proteins.(Assume the proteins are single polypeptides.)
a.an integral membrane protein with the N-terminus exposed on the surface
b.an integral membrane protein with the C-terminus exposed on the surface
c.an integral membrane protein with three hydrophilic loops (only)exposed on the surface
d.a membrane-associated protein facing the cytoplasm
e.an imbedded membrane protein