Download Unit 4 Review Sheet Name 1. Diffusion is the movement of

Unit 4 Review Sheet
Name ___________________________________
1. Diffusion is the movement of molecules from the area of __________________concentration to the area of
__________________concentration.
2. Osmosis is the movement of __________________across a selectively permeable membrane.
3. A cell is isotonic to a solution of 0.01% sugar.
A. What concentration would by hypertonic? __________________________
B. What concentration would be hypotonic? ___________________________
4. a) What happens to an animal cell in a hypotonic solution? ____________________________________
b) What happens to an animal cell in a hypertonic solution? ____________________________________
5. List 3 ways in which active transport differs from the process of diffusion across a cell membrane.
I.
II.
III.
6. List 2 ways in which facilitated transport differs from active transport.
I.
II.
7. Within each of the three pairs, choose the more concentrated solution:
1st Pair: a. 80% water, 20% starch
b. 90% water, 10% starch
Most Concentrated _______________
2nd Pair: a. 5 g salt, 50 g water
b. 5 g salt, 25 g water
Most Concentrated _______________
3rd Pair: a. 85% solvent, 15% solute
b. 75% solvent, 25% solute
Most Concentrated _______________
True or False:
8.
9.
10.
11.
If a plant cell is placed in salt solution, the central vacuole will shrink
If a red blood cell is placed in distilled water (no solutes), it will shrink
If a plant cell is placed in distilled water (no solutes), the cell membrane will lose internal pressure
If a red blood cell is placed in a salt solution, salt will enter the cells, giving them a strange appearance
12. A small lipid molecule passes easily through the cell membrane. Which of these statements is the most likely
explanation?
A.
B.
C.
D.
A protein carrier must be at work
The cell membrane is partly composed of lipid molecules and simple diffusion is occurring
The cell is expending (using) energy to do this
Phagocytosis has enclosed this molecule in a vacuole
13. Which of these does not require an expenditure (usage) of energy?



Diffusion
Osmosis
Phagocytosis



Facilitated Diffusion
Endocytosis
Exocytosis
14. The thyroid gland contains a high concentration of iodine. Adding iodine to an area that already has a high
concentration would be an example of:
A.
B.
C.
D.
passive transport
active transport
facilitated diffusion
exocytosis
15. Cell drinking is synonymous with a) cell eating b) endocytosis c) phagocytosis d) pinocytosis
16. Which of the following substances would be taken into a cell by phagocytosis?
A.
B.
C.
D.
water
proteins
simple sugars
small lipids
17. An animal cell will always take in water when placed in a (n):
A.
B.
C.
D.
hypertonic solution
hypotonic solution
isotonic solution
active solution
Consider the diagram to the right.
Note: This is not a cell.
18. Will the concentration of water stay
the same, increase, or decrease over
time? _____________________
Side A
Side B
20% Protein
4% Glucose
75% w ater
2% Glucose
E.
98% Water
membrane
19. Will the concentration of protein on side A stay the same, increase, or decrease over time? __________
20. Glucose will cross the membrane in which direction? __________________
21. What type of transport is being represented by the diagram below? _________________________________
22. On the same diagram as 21, label the phosphate groups (polar heads) and the fatty
acid tails.
22. What molecule helps stabilize the plasma membrane’s fatty acids and keeps it flexible?
_______________________________________
23. What is a tell-tale sign that the kidneys are failing? ________________________________________________