Unit 9: Cell transport - Moving substances across a semipermeable membrane Flashcards
1
Q
What does semipermeable mean? How is it based?
A
- Substances move in and out through protein
- or between phospholipid
- Based on concentration (amount of substances in area
2
Q
What is a concentration gardient?
A
- difference in concentration of substances in area
3
Q
What is equilibrium?
A
- balance of substance throughout an area
4
Q
- Does active transport use energy?
- How do substances move?
- Order of concentration?
- When does movement stop
A
- No energy
- moves substances in and out of cell
- substances down concentration gradient
- from high to low concentration
- movement continues until equilibrium is reached
5
Q
What is the function of Diffusion?
A
- movement of solids, liquids, and gasses
6
Q
What is the function of facilitated diffusion?
A
- Passage of substances through transport proteins
7
Q
What is the function of Osmosis?
A
- movement of water across a semipermeable membrane
- through aquaporin (transport protein)
- osmosis depends on the solute concentration inside or outside the cell
8
Q
What are cells constantly surrounded by?
A
- Liquid
9
Q
What is an isotonic solution?
A
- solute concentrations outside and inside the cell are the same
10
Q
What is a hypertonic solution?
A
- high amount of solute, low amount of water
11
Q
What is a hypotonic solution?
A
- Low amount of solute, high amount of water
12
Q
What is turgor preasure?
A
- force exerted outward from the cell membrane against the cell wall
- gives rigidity and shape
13
Q
What is plasmolysis?
A
- low turgor pressure
- membrane and cytoplasm shrink away from the cell wall in plants
14
Q
What is crention?
A
- Low osmotic pressure
- cytoplasm and cell shrink
15
Q
What is cytolysis?
A
- High osmotic pressure
- Results in swelling or bursting of cell
