cell membrane proteins

Question 1

what are the main 2 classes of membrane proteins

Answer 1

integral and peripheral

Question 2

describe the properties of peripheral membrane properties

Answer 2

not embedded within the plasma membrane, are attached to the cytoplasmic/extracellular surface of membrane

Question 3

describe the properties of integral membrane proteins

Answer 3

can be associated with membrane in 3 ways, can span the membrane once or several times, some are embedded but do not cross membrane, some are linked to lipid component that intercalates into membrane

Question 4

describe the different functions of integral proteins

Answer 4

they can act as lipid-binding receptors, also cell adhesion molecules(CAMs) to form physical contacts with extracellular neighbours, important in regulating shape, growth and differentiation of cell

Question 5

describe the different functions of integral proteins

Answer 5

can act as pores/channels, carriers, pumps, enzymes and can be involved in intracellular signalling

Question 6

state another type of membrane protein and its function

Answer 6

docking-marker acceptors, located on inner membrane surface, interact with secretory vesicles leading to exocytosis of vesicle contents