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AP BIOLOGY
WORKSHEET UNIT 2
1. Given an animal cell with pressure = 0, solute potential = -2, and a solution
surrounding the cell with pressure = 0, and solute potential = 0. The cell
membrane is permeable to both water and solute.
a. Solute concentration is initially higher here: ________________
b. Water potential is initially greater here: ______________
c. Water will move in this direction: _____________________
d. If pressure remains constant, how can equilibrium be reached?
2. Given a unique type of cell that is made primarily of a 5% salt solution: The cell
is placed in a 10% salt solution. The membrane is permeable to both salt and the
water.
Answer the following by stating: inside the cell or outside the cell.
a. Initially, water potential is greater: _________________
b. Initially, solute potential is more negative: _______________
c. Water molecules will diffuse TOWARD the: ________________
d. Solute molecules will diffuse TOWARD the: _________________
e. Due to movement of molecules, the cell will: crenate or lyse
3. Given a cell with s solute potential = -12, and pressure potential = 0 and a solution
with solute potential = -24 and pressure potential = 0. The membrane is permeable
to both substances.
a. Water will move in this direction. _________________
b. Solutes will move in this direction __________________
c. Initial water potential of the cell is _______________
4. Use the figure below to answer the following questions.
The solutions in the arms of a U-tube are separated at the bottom of the tube by a
selectively permeable membrane. The membrane is permeable to NaCL but not to
glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M NaCL, and side B is
filled with a solution containing 0.8 M glucose and 0.4 M NaCL. Initially, the volume in
both arms is the same. (i = 1 for glucose, and i = 2 for NaCl,the temperature is 22°C)
Circle the correct answer
Initially side A is _______________to side B.
Hypoosmotic
hyperoosmotic
isoosmotic
If you examine side A after 3 days, what would one expect to find with regard to the
concentration of NaCl and the water level?
5. Given the following information and the graph below, answer the next three
questions. Five dialysis bags, impermeable to sucrose, were filled with various
concentrations of sucrose and then placed in separate beakers containing an initial
concentration of .6M sucrose solution. At 10 minute intervals the bags were massed
and the percent change in mass of each bag were graphed.
Which line represents the bag that contained a solution isoosmotic to the .6M solution
at the start of the experiment?
______
Which line represents the bag with the highest initial concentration of sucrose?
_____
Which line or lines represent bags that contain a solution that is hyperoosmotic at the
end of 60 minutes?
_____
BONUS
You are asked to estimate if a certain species of plant could live in a salt marsh. You
collect the following data:
overall water potential of the soil: -25 barrs
solute concentration of plant cell contents: 0.1M (assume i=1, temperature = 13°C)
pressure potential: -19.0 barrs
Do you think the plant could grow in this environment? Why or why not?