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Biology (JIN)

Section 3 vocab / important information

QuestionAnswer
1. What is the definition of "passive transport?" The movement of molecules across a cell membrane without energy input from the cell.
2. What is the definition of "diffusion?" The movement of molecules in a fluid or gas from a region of higher concentration to lower concentration.
3. What role does diffusion play? Small lipids and other nonpolar molecules, such as CO2 and O2, easily diffuse across the membrane.
4. What is the definition of "concentration?" The number of molecules of a substance in a given volume, and it can vary from one region to another.
5. What is the definition of " concentration gradient?" The difference in the concentration of a substance from one location to another.
6. What is one example of this? Tie-dye.
7. What is a isotonic solution? A isotonic solution has a solute concentration higher than the solute concentration inside the cell.
8. What is a hypertonic solution? A hypertonic solution has a solute concentration higher than the solute concentration inside the cell.
9. What is a hypotonic solution? A hypotonic solution has a solute concentration lower than the solute concentration inside a cell.
10. What is the definition of "facilitated diffusion?" The diffusion of molecules across a membrane through transport proteins.
11. What does facilitate mean? To make easier.
12. What are transport proteins? Transport proteins make it easier to enter or exit a cell. But the process is still a form of passive transport.
13. What is osmosis? A process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution to a more concentrated one, thus equalizing the concentrations on each side of the membrane.
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Created by: NegronJI