cell membrane review

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Osmosis Review
The cell membrane separates the internal cell
solution from the exterior cell solution.
Solution
Solution
Cell Membrane consists of the lipid
bilayer, carbohydrates, and proteins.
Water can pass
right through
lipid bilayer
What is a solution?
A mixture of two or more substances.
A solution consists of a solute and a solvent.
A salt water solution…
• Is salt the solute or the solvent?
– Solute
• Is water the solute or the solvent?
– Solvent
• What does the solute do?
– Gets dissolved
• What does the solvent do?
– Does the dissolving
A Salt Water
Solution
Solute
(salt)
Animation
Solvent
(water)
Cell Membrane consists of the lipid
bilayer, carbohydrates, and proteins.
Water can pass
right through
lipid bilayer
The solute can’t fit through the membrane but the water
can. The water moves through to make both sides’
concentrations at a state of equilibrium.
Unit 4: Let’s Review
Osmosis or Diffusion
1. The student sitting next to you just came
from gym class and forgot to shower and you
can tell.
Osmosis or Diffusion
2. After sitting in the bathtub for hours,
your fingers start to look like prunes.
Osmosis or Diffusion
3. The girl sitting two rows ahead of you in Math
class put on way too much perfume this
morning.
Osmosis or Diffusion
4. One way to get rid of slugs in your garden
is to sprinkle salt on them, so they shrivel up.
Osmosis or Diffusion
5. Gargling with salt water when you have a
sore throat causes your swollen throat cells to
shrink and feel better.
Osmosis or Diffusion
6. Oxygen molecules move from the air sacs
in the lungs across the cell membranes into
the blood
Osmosis or Diffusion
7. The supermarket sprays water on the veggies
in the produce section to keep the veggies
crisp.
8. When a cell is placed in a hypotonic
solution, how will the WATER move?
9. When a cell is placed in a isotonic
solution, how will the WATER move?
10. When a cell is placed in a hypertonic
solution, how will the WATER move?
11. When a cell is placed in a hypertonic
solution, how will the SOLUTES (ex. Salt)
move?
12. When a cell is placed in a hypotonic
solution, how will the SOLUTES (ex. Salt)
move?
13. When a cell is placed in a isotonic
solution, how will the SOLUTES (ex. Salt)
move?
14. What type of solutions are the cells in?
15. What type of solutions are the cells in?
16. Placing an animal cell in a hypotonic
solution will cause water to ______________.
A. move into the cell
B. move out of the cell
17. During osmosis water molecules tend to
move _______________
A. up the concentration gradient
B. down the concentration gradient
C. from an area of lower concentration to an
area of higher concentration
D. in a direction that doesn’t depend on
concentration
18. The substance that dissolves to make a
solution is called the ___________________
A. diffuser
B. solvent
C. solute
D. concentrate
A
or
B
19 . The black dots in the diagram above
represent solute molecules dissolved in water.
In which beaker is the concentration of solute
the greatest?
A
B
A
or
B
What TWO answers below that are true.
20. The way to make the concentration in the two
containers above equal would be to _____
A. add more solute to container A
B. add more solute to container B
C. add more solvent to container A
D. add more solvent to container B
21. When the concentration of a solute is the
same throughout a system, the system has
reached __________________.
A. maximum concentration
B. dialysis
C. osmotic pressure
D. equilibrium
22.________________ transport requires
energy from ATP to move substances across
membranes.
A. Passive
B. Active
23. Draw and describe a plant cell in a
hypotonic solution. How will a plant cell
respond differently than an animal cell and
why?
24. Draw and describe a plant cell experiencing
plasmolysis. What type of a solution (hypo-,
hyper-, or isotonic) would cause plasmolysis?
25. What would happen to the mass of a cell in
a hypertonic solution? A hypotonic solution?
An isotonic solution? Why?
26. Are the plant cells in hyper, hypo,
or isotonic solution?
http://www.youtube.com/watch?feature=player
_embedded&v=GOxouJUtEhE
27. Animal Cells in which type of
solution?
28. Animal Cells in which type of
solution?
29. Animal Cells in which type of
solution?
30. Intravenous solutions (IV’s) must be prepared so
that they are isotonic to red blood cells. A solution
of 99.1% water and 0.9% salt is isotonic to red
blood cells. Red blood cells will burst if placed in
A. a solution of 99.3% water and 0.7% salt.
B. a solution of 90% water and 10% salt.
ANSWERS
Osmosis or Diffusion
1. The student sitting next to you just came
from gym class and forgot to shower and you
can tell.
DIFFUSION
Osmosis or Diffusion
2. After sitting in the bathtub for hours,
your fingers start to look like prunes.
OSMOSIS
Osmosis or Diffusion
3. The girl sitting two rows ahead of you in Math
class put on way too much perfume this
morning.
DIFFUSION
Osmosis or Diffusion
4. One way to get rid of slugs in your garden
is to sprinkle salt on them, so they shrivel up.
OSMOSIS
Osmosis or Diffusion
5. Gargling with salt water when you have a
sore throat causes your swollen throat cells
to shrink and feel better.
OSMOSIS
Osmosis or Diffusion
6. Oxygen molecules move from the air sacs
in the lungs across the cell membranes into
the blood.
DIFFUSION
Osmosis or Diffusion
7. The supermarket sprays water on the veggies
in the produce section to keep the veggies
crisp.
OSMOSIS
8. When a cell is placed in a hypotonic
solution, how will the WATER move?
IN THE CELL
9. When a cell is placed in a isotonic
solution, how will the WATER move?
IN AND OUT OF CELL AT AN EQUAL RATE
10. When a cell is placed in a hypertonic
solution, how will the WATER move?
OUT OF THE CELL
11. When a cell is placed in a hypertonic
solution, how will the SOLUTES (ex. Salt)
move?
DOES NOT MOVE (TOO LARGE TO DIFFUSE
ACROSS CELL MEMBRANES)
12. When a cell is placed in a hypotonic
solution, how will the SOLUTES (ex. Salt)
move?
DOES NOT MOVE (TOO LARGE TO DIFFUSE
ACROSS CELL MEMBRANES)
13. When a cell is placed in a isotonic
solution, how will the SOLUTES (ex. Salt)
move?
DOES NOT MOVE (TOO LARGE TO DIFFUSE
ACROSS CELL MEMBRANES)
14. What type of solutions are the cells in?
HYPOTONIC
HYPERTONIC
ISOTONIC
15. What type of solutions are the cells in?
16. Placing an animal cell in a hypotonic
solution will cause water to ______________.
A. move into the cell
B. move out of the cell
17. During osmosis water molecules tend to
move _______________
A. up the concentration gradient
B. down the concentration gradient
C. from an area of lower concentration to an
area of higher concentration
D. in a direction that doesn’t depend on
concentration
18. The substance that dissolves to make a
solution is called the ___________________
A. diffuser
B. solvent
C. solute
D. concentrate
A
or
B
19 . The black dots in the diagram at the left
represent solute molecules dissolved in water.
In which beaker is the concentration of solute
the greatest?
A
B
A
or
B
What TWO answers below that are true.
20. The way to make the concentration in the two
containers above equal would be to _____
A. add more solute to container A
B. add more solute to container B
C. add more solvent to container A
D. add more solvent to container B
21. When the concentration of a solute is the
same throughout a system, the system has
reached __________________.
A. maximum concentration
B. dialysis
C. osmotic pressure
D. equilibrium
22.________________ transport requires
energy from ATP to move substances across
membranes.
A. Passive
B. Active
23.Draw and describe a plant cell in a hypotonic
solution. How will a plant cell respond
differently than an animal cell and why?
Cell Wall
prevents
cell from
bursting!!!
24. Draw and describe a plant cell experiencing
plasmolysis. What type of a solution (hypo-,
hyper-, or isotonic) would cause plasmolysis?
25. What would happen to the mass of a cell in a
hypertonic solution? A hypotonic solution? An
isotonic solution? Why?
Hypertonic solution- Mass decreases
Hypotonic solution- Mass increases
Isotonic solution- Mass stays the same
26. Are the plant cells in hyper, hypo,
or isotonic solution?
http://www.youtube.com/watch?feature=player
_embedded&v=GOxouJUtEhE
HYPERTONIC SOLUTION
27. Animal Cells in which type of
solution?
HYPOTONIC
28. Animal Cells in which type of
solution?
HYPERTONIC
29. Animal Cells in which type of
solution?
ISOTONIC
30. Intravenous solutions (IV’s) must be prepared so
that they are isotonic to red blood cells. A solution
of 99.1% water and 0.9% salt is isotonic to red
blood cells. Red blood cells will burst if placed in
A. a solution of 99.3% water and 0.7% salt.
B. a solution of 90% water and 10% salt.
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