1. Bell ringer: What things do vacuoles store?
Between plant cells and animal cells, which one has a smaller vacuoles?
Why are chloroplast green?
In what part of the cell are ribosomes created?
The Golgi apparatus is known as the ups of the cell, one reason is due to the transporting of molecules. Molecules are transported by means of _____________

2. Bell ringer: Where are Ribosomes created?
What filament do both the cytoskeleton and centrioles have in common?
Lysosomes contain ____________ enzymes that break down wastes.
Cell walls are found in ___________ and ____________ cells

3. The Cell Membrane; Active & Passive Transport
Chapter 7-3
The Cell Membrane; Active & Passive Transport

4. The Cell Membrane Gatekeeper Semi-permeable
Regulates what comes in and out of the cell
Main components: proteins and phospholipids

5. Cell Wall Found only in plant cells and bacteria cells
Main function is support

6. Solutions
Mixtures of substances
Ex. Salt + water; sugar + water

7. Diffusion
The movement of molecules from an area of high concentration to an area of low concentration
Molecules tend to “spread out”
Requires no energy

8. Equilibrium When molecules are evenly spread throughout a space
Homeostasis
Movie starring Christian Bale called “Equilibrium”

9. Bell ringer: (write the question)
The movement of particles from an area of high concentration to low is known as___________
Why is the cell membrane known as semipermeable?
When molecules are evenly spread out this is known as_____________-
How would you define a solution?

10. Osmosis The diffusion of water across a membrane
The cell membrane is selectively permeable
Watch the animation

11. Rule for Osmosis
If the area outside the cell has more salt – then water will be sucked out of the cell

12. U - Tubes

13. Cells In Different Solutions
"ISO" means the same

14. Hypo = less
Cell may burst, or organelles called “contractile vacuoles” remove excess water

15. Hyper = more Cell will shrink or die, plants wilt
Why is it dangerous to drink sea water?
Why does pouring salt on a slug kill it?

16. Bell ringer: What is osmosis?
In which direction does water move in when looking at different solutions?
If a cell is placed in a hypertonic solution what do you expect to occur?
If a cell is placed in a isotonic solution, what will happen to the cell?

17. Osmotic pressure
The force that is produced by the net movement of water out of or into a cell

18. Passive Transport Requires no energy Diffusion & Osmosis
Facilitated Diffusion – carrier proteins “help” molecules across the membrane

19. ACTIVE TRANSPORT Requires the cell to use energy
Proteins or Pumps found in the membrane move materials across

20. Endocytosis Taking “in” large molecules by the cell
Phagocytosis = “phood”, taking in food particles
Pinocytosis = liquid substances

21. EXOCYTOSIS Removing large particles (waste) from the cell
Stuff “exits” the cell
Watch video at
Or McGraw Hill Site

22. Bell ringer (write the question)
Provide two examples of active transport
Which form of transport requires no energy?
Phagocytosis takes in what molecules?
What is the difference between endocytosis and exocytosis?
Label the solutions to the right

23. Passive transport Aquaporins
Water channel proteins that allow water to pass right through them’
The movement of water by facilitated diffusion plays a role in an extremely important biological process, the process of osmosis