unit 4 - cell processes

Question 1

cell membranes are _________ or ______________

Answer 1

• semipermeable
• selectively permeable

Question 2

semipermeability

Answer 2

ability of certain molecules to enter/exit cell

Question 3

cell membrane structure

Answer 3

phospholipid

Question 4

membrane proteins

Answer 4

• surface proteins
  - combined w carbs
• integral proteins
  - transport things across, in, out of cell membrane
  - protein channel, carrier protein, protein pump

Question 5

equilibrium

Answer 5

state of balance
- liquids
- gases
- dissolved substances

Question 6

concentration

Answer 6

measure of amt of a solute in a solution

Question 7

concentration gradient

Answer 7

gradual change in concentration of solutes as function of distance thru a solution

Question 8

tonicity

Answer 8

amt of solute in a solution compared to another solution/cell

Question 9

passive transport

Answer 9

when things pass thru cell membrane naturally

Question 10

simple diffusion

Answer 10

solutes move right thru phospholipids

Question 11

facilitated diffusion

Answer 11

solutes need protein channel to move thru

Question 12

osmosis

Answer 12

movement of water (solvent) ONLY
(solute doesn’t move)

Question 13

• requires 0 energy
• substances move w/ concentration gradient
• high –> low

Answer 13

passive transport