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Chapter 4 ebowen
Active and Passive transport
Question | Answer |
---|---|
What is it called when water is moved into a cell? | Hypotonic Solution |
When a cell is placed in a hypertonic solution, what happens? | water leaves the cell |
What is the main difference between active and passive transport? | Active transport does a major input in energy, passive transport doesn't |
Example of active transport | occurs in your nerve cells |
Types of passive transport | Diffusion |
Why is the plasma membrane considered semipermeable? | because of chemical composition |
the process where a cell engulfs a macromolecule, forming a vesicle? | Endocytosis |
What is diffusion? | Movement of molecules from an area of high concentration to area of low concentration; requires no energy |
Explain the results of a sodium-potassium pump working across the membrane. | moves sodium out of the cell and potassium into the cell, both against their concentration gradients. |
does facilitated transport move a substance down or up a gradient | Down |