Cell Transport
Complete the table by checking the correct column for each statement:
Statement
Isotonic solution
Hypotonic solution
Causes a cell to swell
Doesn’t change the shape of a cell
Causes osmosis
Causes a cell to shrink
Match the term with its correct description:
a. energy
b. osmosis
c. endocytosis
d. diffusion
Hypertonic solution
e. active transport
f. exocytosis
g. equilibrium
h. passive transport
________ Is used during active transport but not passive transport
________ Process by which a cell takes in material by forming a vacuole around it
________ Particle movement from an area of higher concentration to an area of lower concentration
________ Process by which a cell expels wastes from a vacuole
________ Particle movement from an area of lower concentration to an area of higher concentration
________ Diffusion of water molecules through a selectively permeable membrane
________ When the molecules of one substance are spread evenly throughout another substance to become
balanced
________ The movement of substances through the cell membrane without the use of cellular energy
In the space at the left, write true if the statement is true. If the statement is false, change the italicized term to
make the statement true. Write this answer in the blank provided.
_______________ 7. A solution in which the concentration of dissolved substances is lower than the
concentration inside a cell is hypertonic.
_______________ 9. In passive transport, the movement of particles across a membrane requires energy.
_______________ 10. Endocytosis is a process by which a cell membrane surrounds and takes in material
from the environment.
_______________ 12. A membrane that allows only some materials to pass through shows selective
permeability.
13. Which of the following is not a form of passive transport?
facilitated diffusion
diffusion
endocytosis
osmosis
14. Diffusion continues until
equilibrium is reached
turgor pressure is reached
one side has more
15. If a cell is placed in salt water, water leaves the cell by
osmosis
diffusion
active transport
phagocytosis
Label the diagrams of cells using the following terms: diffusion, active transport, osmosis, equilibrium. The
arrows show the direction of transport. You may use the terms more than once!
High
CO2
levels
8 H2O
molecules
25 glucose
molecules
2 H2O molecules
Low CO2 levels
High
protein
levels
2 H2O
molecules
8 H2O molecules
5 glucose molecules
10 H2O
molecules
Low protein levels
10 H2O molecules
Osmosis Practice Activity
Osmosis is the diffusion of water from an area of high concentration to an area of low concentration. Only
water moves in osmosis! The diagrams below show the concentration of water and salt inside the cell and the
concentration of water and salt surrounding the cell. Complete the sentences below by comparing the
concentration of the water inside the cell and the concentration outside the cell.
1.
5% NaCl
95% H2O
95% NaCl
5% H2O
a. Water will flow _____________________ (into
the cell, out of the cell, in both directions).
b. The cell will ______________________
(shrink, burst, stay the same).
2.
5% NaCl
95% H2O
5% NaCl
95% H2O
a. Water will flow _____________________ (into the
cell, out of the cell, in both directions).
b. The cell will ______________________ (shrink,
burst, stay the same).
a. Water will flow _____________________ (into the
cell, out of the cell, in both directions).
3.
95% NaCl
5% H2O
5% NaCl
95% H2O
b. The cell will ______________________ (shrink,
burst, stay the same).
Complete the following chart comparing the various methods of cell transport.
Transport
Method
Active or Passive
Transport Direction
(along or against
concentration gradient)
Uses ATP
(Y or N)
Diffusion
Osmosis
Endo/Exocytosis
4. At which solution of concentration gradient is each cell diagram? (Hypotonic, Hypertonic, Isotonic)
INCLUDEPICTURE
"http://www.williamsclass.co
m/SeventhScienceWork/Ima
gesCellBricks/isotonic.jpg" \*
MERGEFORMATINET
a. _____________
b. ________________
c. ____________
5. This diagram is moving from a high to a low concentration: ___________________
7. Describe the processes occurring in the following pictures: