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Class
Cell Transport
Diagramming:
1.Cell
2.Polar Head
3. Phospholipid
5. Hydrophobic
4. Non-polar tails
Use the word bank below to answer the diagram questions above:
Phospholipid
Non-polar Tails
Hydrophilic
Hydrophobic
Polar Head
Cell
Use the diagram above to answer the following question
6. Explain why the water shown in the diagram must use a channel protein to get through the
membrane.
Water is polar and the tails of the phospholipids are non-polar, so they don’t mix. Instead
water must use a protein channel to enter the cell (facilitated diffusion). The protein
channel is called an aquaporin.
Multiple Choice
Write the letter that best answers the question or completes the statement on the line provided.
_____ 7. Which of the following is a function of the cell membrane?
a. breaks down lipids, carbohydrates, and proteins from foods
b. stores water, salt, proteins, and carbohydrates
c. keeps the cell wall in place
d. regulates the movement of materials into and out of the cell
_____ 8. The cell membrane contains channels and pumps that help move materials from one side to
the other. What are these channels and pumps made of?
a. carbohydrates
c. bilipids
b. lipids
d. proteins
_____ 9. Diffusion occurs because
a. molecules are attracted to one another.
b. molecules constantly move and collide with each other.
c. cellular energy forces molecules to collide with each other.
d. cellular energy pumps molecules across the cell membrane.
_____ 10. An animal cell that is surrounded by 100% water will burst because the osmotic pressure
causes
a. water to move into the cell.
c. solutes to move into the cell.
b. water to move out of the cell.
d. solutes to move out of the cell.
Completion
Complete each statement on the line provided using the word bank below
Solute
Solvent
Phospholipid
Polar/non-polar
Facilitated
Carbohydrate
11. ____Phospholipids____________________ has polar and non-polar parts and makes up the
majority of the cell membrane.
12. The material that gets dissolved in a solution is called the _solute______.
13. ___Solvent______________ is the material that does the dissolving in a solution.
14. Identification (ID) tags that are displayed on the surface of the cell are made from the organic
molecule __carbohydrates_______ and are used for cell recognition.
15. The cell membrane can rearrange itself if it is disturbed because the tiny parts that make up the bilayer are _polar/nonpolar_____________, which pull them back into place.
16. ___Facilitated__________diffusion uses a protein to help large molecules move through the
membrane
Use the diagram below to answer the following questions on the lines provided. (2pts ea.)
A student put together the experimental setup shown below. The selectively permeable
membrane is permeable to water, but not the solute shown.
Figure 7–4
17. How does the solution on Side A of the apparatus shown in Figure 7–4 differ from the solution on
Side B?
Side A has more water and less solute (particles) than side B. Side B has more solute, which
means it has less water.
18. Describe the movement of water in the experimental setup. In other words, predict which way the
water will move.
The water will move from Side A toward Side B. We know this because less solute on side A
means “high water” and water moves from high to low.
19. The diagram shows a special type of diffusion. List what type of diffusion is shown and explain
how it works.
The type of diffusion is osmosis, or the movement of water from an area of higher
concentration to an area of lower concentration.