Name: _________________________________________________________ Date: ________________________ Class: ________
Diffusion Practice Worksheet
Diffusion is the ___________________ of molecules from an area of _______________ concentration to an area of
______________ concentration.
Molecules diffuse when there is a concentration gradient (difference). Use the following table to describe what happens
to each of the above cells A, B, and C after they are put in each of the Solutions 1, 2, 3. Remember: the cell membrane
is semi-permeable—that means the triangles cannot get through while the circles can.
Cell/Solution
Concentration of
Triangles
Concentration of
Circles
A
B
C
1
2
3
Cell into
Solution
1
A into 1
2
A into 2
3
A into 3
4
B into 1
5
B into 2
6
B into 3
7
C into 1
8
C into 2
9
C into 3
What Happens to the cell size
Explanation
Name: _________________________________________________________ Date: ________________________ Class: ________
Directions:
1. Cut and paste the cells pictured in section A into each of the solutions in section B.
2. Draw an arrow using a color pencil to show the direction in which molecules will diffuse across the
membrane.
3. Cut and paste your final copy into your journal under the title “Diffusion of Molecules.”
Section A
Section B
Name: _________________________________________________________ Date: ________________________ Class: ________
Cell Membrane Movement Worksheet
Directions: Complete the table comparing the types of movement across a membrane.
Facilitated
Passive Transport
Diffusion
Diffusion
Uses energy?
Y or N
Types of
Molecules
Movement
through
phospholipid
bilayer?
Y or N
Uses transport
proteins?
Y or N
Direction:
In, Out, Both
Concentration
Gradient?
Down or Against
Words to help
you remember
Osmosis
Active Transport
Endocytosis
Exocytosis
Name: _________________________________________________________ Date: ________________________ Class: ________
Diffusion Practice Worksheet
Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.
Molecules diffuse when there is a concentration gradient (difference). Use the following table to describe what happens
to each of the above cells A, B, and C after they are put in each of the Solutions 1, 2, 3. Remember: the cell membrane
is semi-permeable—that means the triangles cannot get through while the circles can.
A
Concentration of
Triangles
5
Concentration of
Circles
0
B
0
5
C
5
5
1
0
15
2
16
0
3
10
10
Cell/Solution
Cell into
Solution
What Happens to
the cell size
Explanation
1
A into 1
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
2
A into 2
Cell is unchanged
Triangles cannot pass across the membrane.
3
A into 3
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
4
B into 1
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
5
B into 2
Cell gets smaller
Circles diffuse out of cell because its concentration is lower outside the cell.
6
B into 3
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
7
C into 1
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
8
C into 2
Cell gets smaller
Circles diffuse out of cell because its concentration is lower outside the cell.
9
C into 3
Cell gets bigger
Circles diffuse into cell because its concentration is higher outside the cell.
Directions:
Name: _________________________________________________________ Date: ________________________ Class: ________
4. Cut and paste the cells pictured in section A into each of the solutions in section B.
5. Draw an arrow using a color pencil to show the direction in which molecules will diffuse across the
membrane.
6. Cut and paste your final copy into your journal under the title “Diffusion of Molecules.”
Name: _________________________________________________________ Date: ________________________ Class: ________
Cell Membrane Movement Worksheet
Directions: Complete the table comparing the types of movement across a membrane.
Facilitated
Passive Transport
Diffusion
Diffusion
Osmosis
Active Transport
Endocytosis
Exocytosis
Uses energy?
N
N
Y and N
N
Y
Y
Y
SMALL,
UNCHARGED
MOLECULES
LARGER
MOLECULES
NEEDING HELP
GETTING ACROSS
WATER
LARGER, CAN BE
CHARGED
FOOD
WASTE
PRODUCTS OF CELL
Y
Y
Y
Y
N
N
N
N
Y
N
N
N
BOTH
BOTH
BOTH
BOTH
BOTH
IN
OUT
DOWN
DOWN
DOWN
DOWN
AGAINST
AGAINST
AGAINST
Proteins help
Water moves
Y or N
Types of
Molecules
Movement
through
phospholipid
bilayer?
Y or N
Uses transport
proteins?
Y or N
Direction:
In, Out, Both
Concentration
Gradient?
Down or Against
Words to help
you remember
When you are
passive no energy
is required
Molecules move
Action needs
energy
Endo- means “in”
Exo – means “out”