Movements Across Membranes

Question 0

Membranes are…

Answer 0

Selectively permeable

Question 1

Plasma membranes maintain

Answer 1

Cellular integrity

Question 2

Movement of particles from an area of higher concentration to lower concentration

Answer 2

Diffusion

Question 3

• Special type of diffusion

* movement of water across a selectively permeable membrane from higher to lower

Answer 3

Osmosis

Question 4

Normal for plant cell

Answer 4

Hypotonic

Question 5

More solute outside the cell

Answer 5

Hypertonic

Question 6

• Carrier mediated
• Down the concentration gradient
• No energy required
• Example: Glucose

Answer 6

Facilitated diffusion

Question 7

• Requires transporters
• Moves against the concentration gradient
• Requires energy (ATP)

Answer 7

Active transport

Question 8

• ingestion of material by cell

* Requires energy

Answer 8

Endocytosis

Question 9

• “Cell Eating”

* Plasma membrane forms a pocket that engulfs solid material

Answer 9

Phagocytosis

Question 10

• “Cell Drinking”

* Small areas of plasma membrane invaginate to forming tiny vesicles

Answer 10

Pinocytosis

Question 11

Invaginated pits and vesicles

Answer 11

Caveolae

Question 12

_______ for ions are concentrated on calveolae

Answer 12

Receptors

Question 13

Specific molecules present in low conc in extracellular fluid

Answer 13

Ligands

Question 14

Proteins that coat inner surface of plasma membrane

Answer 14

Clathrins

Question 15

Region invaginates and forms

Brings ligands to cell

Answer 15

Clathrin-coated pits

Question 16

____ is uncoated

Answer 16

Pit

Question 17

Receptor and membrane are recycled

Answer 17

•

Question 18

Lysosome fused with remaining vesicle

Answer 18

Endosome