1. The plasma membrane consists of a phospholipid bilayer held together
by ____________ interactions.
2. ____________ fatty acids in the bilayer makes the bilayer more fluid; this is
due to the kinks in the fatty acid chain formed by the angular double bonds.
3. ____________ and _____________ are denied access through the plasma membrane by
passive transport; only ____________ readily enter the membrane under random molecular motion.
4. ____________ act as cell identity markers and serve to regulate the action of membrane
proteins involved in cell growth.
5. Glycoproteins remove approximately ______ of the blood's low-density lipoproteins and
aid in regulating blood cholesterol levels.
6. Cholesterol is a type of sterol present in the lipid bilayer; its function is to provide
____________ to the tail region of the phospholipid matrix.
7. Diffusion occurs as a result of __________________.
8. Faciliated diffusion, a process thought to involve ______________, constitutes __________ transport.
9. Active transport requires ___________ expenditure. In the model of the sodium-potassium pump, sodium is pumped _____ and potassium is pumped _____.
10. In sodium-coupled transport, the favorable electro-chemical gradient for sodium's entry into the cell is utilized to transport a second molecule, ___________ into the cell.
11. Specialized cells form phagocytic/pinocytic ____________ to intake solids/liquids in bulk, a process called ____________.
12. The six principal functions of membrane proteins are: ________________.