What is the likely identity of these membrane-associated proteins: 

(a) Released from the membrane with a high-salt solution causing disruption of ionic linkages; 

(b) Not released from the membrane upon exposure to a high-salt solution alone, but released when incubated with an enzyme that cleaves phosphate-glycerol bonds and covalent linkages are disrupted; 

(c) Not released from the membrane upon exposure to a high-salt solution, but released after addition of the detergent sodium dodecyl sulfate (SDS). Will the activity of the protein released in part (c) be preserved following release?