Ch 7.3 Pretest: Cell Transport

Ch 7.3 Pretest: Cell Transport

Name: ______Period: _____ Date: ______

Explain these three terms with relation to the cell membrane:

1. Phospholipid bilayer

Double membrane that makes up the cell membrane. Made of phosphate heads and lipid tails.

2. Fluid mosaic

Model used to describe the cell membrane. Fluid- mostly liquid Mosaic- made of proteins and phospholipids

3. Selectively permeable

Describes the cell membrane

Only allows for some things to pass in and out of the cell

4. There are basically two kinds of cell transport: active and passive. What is the

difference? Give an example of each.

Passive- No energy required, goes from a high concentration to a low concentration, with the concentration gradient ex. Osmosis and diffusion

Active- Energy is required, goes from a low concentration to a high concentration, against the concentration gradient, ex: endocytosis and exocytyosis

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 facilitateddiffusion:

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 (water) (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 notuse 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

water is higher on outside- causing the cell to swell

24. Isotonic

at equilibrium, molecules moving in and out of the cell at a constant rate, no change in cell size

25. Hypertonic

Water concentration is greater inside the cell, causing the cell to shrink

Identify each image as: diffusion, facilitated diffusion, osmosis, protein pump,

exocytosis or endocytosis.

26. ______protein pump, 27. ______osmosis, ____

28. ______endocytosis. 29. facilitated diffusion

30. ______ diffusion31. ___exocytosis