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Membrane allows some substsances to cross more easily than others and blocks the passage of some substances all together
What factors affect selective permeability?
- Size of particles
- If the particles dissolve in water
- Conditions inside and outside the cell
- Structure of membrane -nuclear vs. cell
What are cells constantly changing?
What must cells adjust to, to maintain balance?
Steady state; balance
Movement of molecules from an area of higher concetration to an area of lower concentration
Gradual even spreading out of molecules
What factors affect the rate of Diffusion?
- Size of the Molecule
- Type of Membrane
What are the 7 types of Molecules?
- Carbon Dioxide
What are the two types of molecules that cannot pass through?
Fat and Starch
What else can Fat be known as?
What else can sugar be known as?
What else can Salt be known as?
What else can starch be known as?
What needs to listed on a Diffusion problem?
- 1. Plant or Animal
- 2. Osmosis or Diffusion
- 3. In and out table
- 4. The arrows drawn on the diagram
Solutes greater inside than outside
Solutes greater outside than inside
Equal solute concentration
What types of cells do Turgor Pressure take place in?
What does Turgor Pressure do to plants?
Makes them stiff and healthy
Does a plant cell swell during Turgor Pressure and why?
No because it has a cell wall
What does Turgor Pressure do to the cells?
- Water moves in
- Pressure pushes against the cell wall
- Plant cell becomes healthy
Water flows out of the cell and pressure is lost. The cell membrane shrinks.
What types of cells does Plasmolysis occur in?
Plant and Animal
What happens if a plant loses water?
What happens to Animal Cells during plasmolysis?
The cells membrane shrinks
How do animal cells pump water out of the cell?
Examples of a contractile vacuole?
What is it called when there is too much water in an animal cell and it busts due to pressure?
What type of cell does Cytolysis occur in/
When you are given a diagram that has a square inside a square cell, it is easy to see that it is a plant cell, but why is it a plant cell?
It has a cell wall
How do you Osmosis problems?
- 1. Plant or Animal?
- 2. Osmosis or Diffusion?
- 3. Hypotonic, isotonic, or hypertonic?
- 4. in and out chart
- 5. words to describe it
- 6. Redraw to show what was done
What happens to water in an isotonic solution?
Water molecules move equally in both directions
What happens to the water molecules in a Hypertonic solution?
Water molecules move out of the cell and cause the cell to shrink
What happens to water molecules in Hypotonic solution?
Water molecules move into the cell causing it to swell.
What happens during Turgor Pressure?
The plant cell gains water
What happens during Plasmolysis to both cells?
The cells lose water
What happens during Cytolisis
The animal cell gains water and bursts