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Use with Bozeman Science Video: Transport Across Cell Membranes—13:58
Unit 4—Homeostasis and Transport
1. The process of random movement of molecules throughout a space is called _______________.
2. _______________ is the energy that is used during active transport.
3. Define osmosis.
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4. What are two major differences between active transport and passive transport?
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5. What does it mean to move with your concentration gradient?
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6. Explain why a slug shrivels up when you put salt on it.
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7. Briefly explain the following words:
a. Hypertonic:
b. Hypotonic:
c. Isotonic:
8. In order for facilitated diffusion to work you must have a __________________________.
9. What is the most famous example of active transport?_______________________________
10. Give two examples of large scale movement of particles in cells.
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11. ______________________ moves large quantities of materials out of the cell.
Use with Bozeman Science Video: Transport Across Cell Membranes—13:58
After watching the video, complete the following questions.
1. In diffusion, molecules move from
a. Low to high concentration
b. High to low concentration
c. Equal concentration to equal concentration
2. When equilibrium is reached the molecules stop moving
a. True
b. False
3. Hypotonic means
a. Equal concentrations of water inside and outside the cell
b. Higher concentration of salt outside the cell than inside the cell
c. Lower concentration of salt outside the cell than inside the cell
4. Hypertonic means
a. Equal concentrations of water inside and outside the cell
b. Higher concentration of salt outside the cell than inside the cell
c. Lower concentration of salt outside the cell than inside the cell
5. Isotonic means
a. Equal concentrations of water inside and outside the cell
b. Higher concentration of salt outside the cell than inside the cell
c. Lower concentration of salt outside the cell than inside the cell
6. Facilitated diffusion is
a. A form of active transport
b. Diffusion involving only water
c. Movement of molecules from low concentration to high concentration
d. Movement of molecules with the help of a protein
7. Osmosis is
a. Active transport of water
b. Active transport of salts
c. Passive transport of water
d. Passive transport of salts
8. The best definition for active transport is
a. Movement of molecules using energy
b. Movement of molecules down their concentration gradient
c. Movement of molecules against the concentration gradient
d. Movement of molecules against the concentration gradient that requires energy
Use with Bozeman Science Video: Transport Across Cell Membranes—13:58
9. What is the source of energy in active transport
a. Glucose
b. ADP
c. ATP
d. Proteins
10. In the sodium-potassium pump, sodium is pumped_______ the cell and potassium is pumped
______ the cell.
a. Out of, into
b. Into, out of
c. Into, into
d. Out of, out of