Name ________________________________________ Period ____
A. The cell in this beaker is bathed in a 5% NaCl solution. The membrane is permeable to water but not to NaCl.
0.9% NaCl
99.1% H20
5% NaCl
95%H2O
i. In which direction is the net movement of water here?
Water will leave the cell going from high to low (shrinks)
ii. How will this affect the cell?
Cell shrinks because it is losing water to the beaker
The beaker solution is hypertonic because it has more solute than
the cell
Matching
1. Passive transport b
a. part of the membrane that is on the outside polar
2. Hydrophobic tails f
b. no energy required, down (with) concentration gradient
3. Carbohydrate e
c. solution that causes cells to shrink
4. Osmosis h
d. move against concentration gradient, energy required
5. Hypertonic c
e. used for identification purposes on the cell membrane
6. Proteins g
f. part of the membrane that faces inward non-polar
7. Hydrophilic heads a
g. channels or pumps that move material in and out of cell
8. Phagocytosis j
h. movement of water molecules across a membrane
9. Hypotonic i
i. solution that causes a cell to enlarge
10. Active transport d
j. when cells consume large solid molecules
Examine the diagram below:
Solute particles are the large particles.
The smaller particles represent water.
A. Before equilibrium is reached, which side is hypertonic?
The left side of the box is hypertonic because it contains solute molecules and less water
B. Describe which way the water will move. The water will move from right to left (high to low).
Use the pictures on the left to answer the questions on the right.
1. After digestion:
= glucose molecule
blood
cell
a. Which side has the higher concentration of glucose? __Blood side__
b. Which way will the glucose go? __into the cell____
c. Does this require energy? ___no (because high to low)________
d. Is this active or passive transport? __passive_____________________
e. What specific type of transport is this? ___facilitated diffusion (glucose
uses a protein channel to get into the cell___
2. Easter egg coloring:
A blue food coloring tablet is placed in a cup of vinegar and water. The blue tablet will
dissolve and spread evenly throughout the liquid.
beaker
a. Is this active or passive transport? ____passive_______________
b. Is this diffusion or osmosis? ____diffusion___________________
c. Does this require energy? ____No_____________________
d. Is the blue die going from a lower to a higher concentration,
or from a higher to a lower concentration? ______________
Water and
vinegar
Blue food color
tablet
3. Plant cell after being over-watered.
a. Water rushes into the plant cell’s vacuole. Is this diffusion or
osmosis? ___osmosis______________________
b. Is this passive or active transport? ____passive_________________
c. What is the force called that causes water to rush into the plant cell?
________osmosis____________________
d. Does turgor pressure increase or decrease? __increase__________
e. Is the plant cell in a hypertonic, hypotonic, or isotonic environment?
_______hypotonic__________________________
4. Plant cell after not being watered lately, so it has begun to wilt:
a. Which way will the water go? Into the vacuole, or out of the vacuole?
____out of the vacuole__________________
b. By what process will the water move? osmosis
c. Does turgor pressure increase or decrease? __decrease__________
d. Is the plant cell in a hypertonic, hypotonic, or isotonic environment?
____hypertonic_________________________
5. An amoeba engulfs a particle of food.
a. Does this require energy?____Yes___________________
b. Is this active or passive transport? ___Active_______________
c. Is this endocytosis or exocytosis?
___endocytosis_______________
6. An amoeba expels waste.
a. Does this require energy?______Yes_________________
b. Is this active or passive transport?
____Active______________
c. Is this endocytosis or exocytosis?
_____exocytosis_____________
7. A cell surrounded by blood:
a. Will water move from the blood to the cell,or from the cell to the blood?
_____blood to cell___________________
b. Which has the higher concentration of water, the cell or the blood?
____blood______________
c. Does this require energy? ___No___________________
d. Is this active or passive transport? ____passive______________
e. Is this diffusion or osmosis? ___osmosis____________________
f. Does the blood cause a hypotonic or hypertonic environment for the cell?
_____hypotonic____________________