Biological Membranes

Question 1

Osmotic pressure?

Answer 1

colligative property, pressure applied to a pure solvent to prevent osmosis and is related to the concentration of the solution

pi= iMRT

Question 2

Passive transport?

Answer 2

does not require ATP b/c molecule moves down its concentration gradient or from an area of high to low concentration

• simple diffusion
• osmosis
• facilitated diffusion

Question 3

Simple diffusion?

Answer 3

does not require a transporter, small nonpolar molecules passively move from an area of high concentration to an area of low concentration until equilibrium is achieved

Question 4

Osmosis?

Answer 4

describes the diffusion of water across a selectively permeable membrane

Question 5

Facilitated diffusion?

Answer 5

uses transport proteins to move impermeable solutes across the cell membrane

Question 6

Active transport?

Answer 6

requires energy in the form of ATP (primary) or an existing favorable ion gradient (secondary)

secondary- symport, antiport

Question 7

Pinocytosis?

Answer 7

ingestion of liquid into the cell from vesicles formed from the cell membrane

Question 8

Phagocytosis?

Answer 8

ingestion of solid material