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Cell Transport: Practice what you know
Graphic Organizer
Cell Membrane
1. Label the following structures in the cell membrane below:
• hospholipids
• marker protein
• protein channel
• cholesterol
• phospholipid bilayer
• hydrophobic side
• hydrophilic side
Passive Transport: Diffusion
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
2. Draw the balloon and the perfume demonstration. Represent the perfume molecules by small dots.
3. Explain, in scientific terms, why you were able to smell the perfume through the balloon.
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4. In the beakers below, draw what happens over time to the drop of food coloring in the water.
5. Explain, in scientific terms, what happened when we placed a few drops of food coloring in a beaker with water.
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Passive Transport: Osmosis
Osmosis is the movement of WATER from an area of high water concentration to an area of low water concentration.
6. Draw and describe the carrot placed in regular water.
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7. Draw and describe the carrot placed in salty water.
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8. Explain, in scientific terms, what happened to the carrot in salty water.
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Active Transport: Protein pumps
Active transport is the movement of molecules from LOW to HIGH concentration using ATP ENERGY and PROTEIN gates (channels). The particles go against the concentration gradient (against the flow).
9. Explain, in scientific terms, what is happening to the Hydrogen ions (H+) in this diagram.
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Active transport: Exocytosis and Endocytosis
Movement of materials using vesicles (pockets of cell membrane). Requires energy (ATP).
10. Label: endocytosis and exocytosis in the diagram below.
Explain what is happening in both sides of this diagram. Please use scientific words when possible.
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Identify the diagrams below as showing DIFFUSION, OSMOSIS, PROTEIN PUMPS, EXOCYTOSIS, ENDOCYTOSIS.
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1. 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 |
2. Diffusion occurs because
|a. |molecules constantly move and collide with each other. |
|b. |the concentration of a solution is never the same throughout a solution. |
|c. |the concentration of a solution is always the same throughout a solution. |
|d. |molecules never move or collide with each other. |
3. When the concentration of molecules on both sides of a membrane is the same, the molecules will
|a. |move across the membrane to the outside of the cell. |
|b. |stop moving across the membrane. |
|c. |move across the membrane in both directions. |
|d. |move across the membrane to the inside of the cell. |
4. Which type of particle transport requires input of energy from the cell? …………………………….………..
5. All of the following are examples of cell specialization EXCEPT
|a. |a pancreatic cell that produces protein-digesting enzymes. |
|b. |muscle cells that control movement of materials in the body |
|c. |a prokaryotic cell that carries out photosynthesis. |
|d. |a red blood cell that carries oxygen. |
6. Molecules that are too large to be moved through the membrane can be transported into the cell by
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7. Molecules that are too large to be moved across a cell membrane can be removed from the cell by………………………………………………………………….………………….………………
8. A cell moves particles from a region of lesser concentration to a region of greater concentration by ………………………………………………………………………………….……………………….
9. The structure most responsible for maintaining cell homeostasis is the _____.
|a. |cytoplasm |c. |cell wall |
|b. |mitochondrion |d. |plasma membrane |
10. Which processes are shown in these two figures? Label them.
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No Energy Needed
Energy Needed
Cellular Transport
Protein Pump
O2
Cell
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