Trypsin is a hydrophilic protease and therefore is unable to cross the plasma me

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