Name:________________________________________ Date:___________________ Class:______________
Cellular Transport
Cell Membrane, Diffusion, Osmosis
Fill in the blanks below (1 point each)
1. The cell membrane is composed of a ___________________________________ bilayer.
2. The head of the phospholipid is ______________________________, or water loving, while the tail of
phospholipids are _________________________________, or water fearing.
3. Cell membranes are ______________________________________, meaning they are selective with
the material passing in and out.
4. _______________________________ are the only material that can freely pass through the cell
membrane.
5. _______________________________ is the movement of molecules from high levels of concentration
to areas of low concentration.
6. ________________________________ diffusion occurs when lipids simply move through the
phospholipid bilayer with no assistance.
7. ________________________________ diffusion requires the help of a protein channel to allow
materials to pass in and out of the cell.
8. Simple and facilitated diffusion do not require _____________________________ to occur.
9. ____________________________ transport occurs when molecules move against the concentration
gradient.
10. Molecules move from areas of ______________________ concentration to ______________________
concentration in active transport.
11. A ________________________________ pump is required to move molecule against the
concentration gradient in active transport.
Diagrams (2 points each)
In the diagrams below, draw arrows on the left side to show which way the molecules (stars) would move by
diffusion. Represent into the cell with a purple arrow, out of the cell with a green arrow, and no
movement with a red arrow pointing both ways. The circle represents the cell; therefore the circle’s
boundary is the cell membrane.
12. d
Inside the cell
Outside the cell
Inside the cell
13.
Outside the cell
Inside the cell
14.
Outside the cell
Protein Pump
15. What type of transport is the cell above undergoing? How do you know? (2 points)
____________________________________________________________________________________
____________________________________________________________________________________
16. What is the picture below a diagram of? _______________________________________
17. Label the two parts that the arrows are point to. Identify them as hydrophobic or hydrophilic.
Cell Membrane (2 points each)
18. Identify the parts below using the word bank. Once finished, color the parts of the membrane the color
identified in paranthesis.
Protein Molecule (blue)
Protein Channel (red)
Carbohydrate Chain
Phosphate Head (purple)
Phospholipid Bilayer
Lipid Tail (green)
True/False (1 point each)
19. ___________A cell membrane has many components, including a phospholipid bilayer and protein
channels.
20. ___________Protein channels are needed for simple diffusion
21. ___________Protein pumps are needed for active transport
22. ___________Diffusion is the movement of molecules from an area of high concentration to an area of
low concentration
23. ___________Energy is needed for simple diffusion
24. ___________Water can pass directly through the cell membrane.
25. ___________Lipids can pass directly through the cell membrane.
26. ___________Facilitated diffusion requires the help of protein channels