Download Name: Period: _____ Date

Name: __________________________________ Period: _____ Date: ____________________
Ch 7.3 Pretest: Cell Transport
Explain these three terms with relation to the cell membrane:
1. Phospholipid bilayer
2. Fluid mosaic
3. Selectively permeable
4. There are basically two kinds of cell transport: active and passive. What is the
difference? Give an example of each.
5. – 7. Describe diffusion:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
8. – 10. Describe facilitated diffusion:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
11. – 13. Describe osmosis:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
14. - 16. Describe protein pumps:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
17. – 19. Describe facilitated endocytosis:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
20. – 22. Describe facilitated exocytosis:
 Example of active/passive (circle one)

Moves things into/out of the cell (circle one or both!)

Moves with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not specific (circle one)

Uses/does not use carrier proteins (circle one)
Define and tell what a cell would do in each kind of solution below:
23. Hypotonic
24. Isotonic
25. Hypertonic
Identify each image as: diffusion, facilitated diffusion, osmosis, protein pump,
exocytosis or endocytosis.
26. ________________________
28. _________________________
30. ______________________
27. ________________________
29. _____________________
31. ____________________
Answer Key_
Name: _
Period: _____ Date: ____________________
Ch 7.3 Pretest: Cell Transport
Explain these three terms with relation to the cell membrane:
1. Phospholipid bilayer
Two layers of phosphate and lipid molecules
back to back. The outside is hydrophilic (“water
loving”; water soluble; polar) while the inside is
hydrophobic (“water hating”; water insoluble;
nonpolar)
2. Fluid mosaic
Besides phospholipids there are other
molecules (carbohydrates, proteins) that make it up.
It is dynamic and moving.
3. Selectively permeable
Only certain things are chosen to pass
through. Others are kept out.
4. There are basically two kinds of cell transport: active and passive. What is the
difference? Give an example of each.
Active takes energy from the cell (ATP) and can
go against a concentration gradient (from low to high
concentration). Endocytosis, exocytosis, pinocytosis,
phagocytosis and protein pumps are all examples.
Passive does not take energy from the cell and
goes with a concentration gradient (from high to low
concentration). Diffusion, osmosis and facilitated
diffusion are all examples.
5. – 7. Describe diffusion:
 Example of active/passive (circle one)

Moves things

Moves
into/out of the cell (circle one or both!)
with/against concentration gradient (circle one)

For large/small molecules (circle one or both!)

Specific/not

Uses/does
specific
(circle one)
not use carrier proteins (circle one)
8. – 10. Describe facilitated diffusion:
 Example of active/passive (circle one)
into/out of the cell (circle one or both!)

Moves things

Moves

For

Specific/not specific

Uses/does not use carrier proteins (circle one)
with/against concentration gradient (circle one)
large/small molecules (circle one or both!)
(circle one)
11. – 13. Describe osmosis:
 Example of active/passive (circle one)
into/out of the cell (circle one or both!)

Moves things

Moves with/against concentration gradient*

For large/small molecules (circle one or both!)

Specific/not specific

Uses/does
of water (circle one)
(circle one)
not use carrier proteins (circle one)
14. - 16. Describe protein pumps:
 Example of active/passive (circle one)
into/out of the cell (circle one or both!)

Moves things

Moves with/against concentration gradient*

For

Specific/not specific

Uses/does not use carrier proteins (circle one)
can (circle one)
large/small molecules (circle one or both!)
(circle one)
17. – 19. Describe facilitated endocytosis:
 Example of active/passive (circle one)
into/out of the cell (circle one or both!)

Moves things

Moves with/against concentration gradient

For

Specific/not specific

Uses/does
* can (circle one)
large/small molecules * large amounts (circle one or both!)
(circle one)
not use carrier proteins * vesicles (circle one)
20. – 22. Describe facilitated exocytosis:
 Example of active/passive (circle one)

Moves things into/out
of the cell (circle one or both!)

Moves with/against concentration gradient

For

Specific/not specific

Uses/does
* can (circle one)
large/small molecules * large amounts (circle one or both!)
(circle one)
not use carrier proteins (circle one)
Define and tell what a cell would do in each kind of solution below:
23. Hypotonic
Solution has lower concentration than cell
Net movement of water is into the cell and it
expands and may explode! (cytolysis)
24. Isotonic
Solution has the same concentration compared
to the cell
Water moves both into and out of the cell at an
equal rate, and the cell does not change size.
25. Hypertonic
Solution has higher concentration than cell
Net movement of water is out of the cell and it
shrinks! (plasmolysis)
Identify each image as: diffusion, facilitated diffusion, osmosis, protein pump,
exocytosis or endocytosis.
26. _
Protein Pump_
28. __
30. _
27. _
Endocytosis__
Diffusion_
Osmosis__
29. _Facilitated
31. _
diffusion_
Exocytosis __