Question

Answer true or false to the following questions please explain your answers and answer all please  

1.The cytoplasmatic side of the integral membrane proteins is often glycosylated.

2. Cholesterol is more enriched at the outer leaflet of the plasma membrana

3.Inner leaflet of the plasma membrane is enriched with glycolipids.

4.Membrane proteins that pomp ions in and out of the cell have specific Km values.

5. A symport would function as an antiport if its orientation in the membrane were reversed

6.The lateral mobility of membrane proteins can be restricted by gap junctions.

Answer 1

1.The cytoplasmatic side of the integral membrane proteins is often glycosylated: False:

Reason:The extracellular side of the integral membrane protein is often glycosylated.

2. Cholesterol is more enriched at the outer leaflet of the plasma membrana: False

Reason: Cholesterol is equally distributed in both leaflets of the plasma membrane.

3.Inner leaflet of the plasma membrane is enriched with glycolipids.False

Reason: Inner leaflet of the plasma membrane is enriched with phospholipids.

4.Membrane proteins that pump ions in and out of the cell have specific Km values.False

Reason: Membrane proteins that pump in and out of the cell are not enzymes and are functional class of transporters and hence do not have specific Km values.

5. A symport would function as an antiport if its orientation in the membrane were reversed.False

Reason:Symport would never function as antiport if its orientation in the membrane is reversed.

6.The lateral mobility of membrane proteins can be restricted by gap junctions.False

Reason:The lateral mobility of membrane proteins can be restricted either by tethering of the protein to the cell cortex inside the cell or by exctracellular matrix molecules that are present outside cell or by diffusion barriers that function to restrict proteins to the membrane.