1. Cell theory

2. The discovery of cells and their structure is linked to the development of the magnifying lenses, particularly the microscope in the late 1600’s
Many scientists of the time recognized the importance of cells as building blocks of living tissue. But not until 1839 did the general statement of "cell theory" receive general acceptance
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3. History: The cell theory Cells are the basic unit of life.
Cells are the basic structural and organizational unit of life.
Cells derive from pre-existing cells.

4. Exceptions to the Cell Theory:
Where did the first cell come from?
Viruses
have a non-cellular structure and can only REPRODUCE within a host cell
Mitochondria & Chloroplasts
have their own DNA
can reproduce within a cell

5. Viruses
Are Viruses Alive? - YouTube

6. ORGANELLE The TRAIL Oregon
You’ve all been hired as the new sheriffs in Cell Town.
A band of Organelles has escaped from the local jail.
YOUR JOB:
Make “Wanted” Posters for all of the Organelles.
Use pages in the textbook.

7. Old book pg 184
New book pg 204

8. Video 1
Video 2

9. Functions of the Cell Membrane
To REGULATE the movement (TRANSPORT) of molecules from one side of the membrane to another
To recognize chemical signals and communicate with other cells using RECEPTORS and
I.D markers

10. Cell Membrane Structure
“Fluid-Mosaic” model
Semi-permeable
A double layer of lipids (fats) with many carrier proteins and receptors imbedded in them
Channel/Transport Proteins – transports larger molecules into and out of the cell with the use of energy (active transport) or without (facilitated diffusion)
Receptors – aid in cell communication as they pick up and receive chemical signals

11. Cell membrane

12. Do now
With a partner on a piece of paper/ in your notes answer these questions:
Based on what we did yesterday why is the “Fluid-Mosaic” model an appropriate name for the cell membrane?
What does it mean to be selectively permeable? And why is it beneficial for the cell?
Timer

13. Transport Passive transport= no energy by cell
Diffusion =Particles move HIGH concentratio LOW concentration
Osmosis= Water (H2O) move HIGH  LOW

14. Do now 10/4/17 With a partner:
Explain how larger molecules such as starch enter into the cell?
State three facts about passive transport.

15. Active transport Transport Particles go from LOW to HIGH concentration
DOES require energy from the cell.

16. Examples of active transport
Sodium potassium pump

17. Active transport

18. Materials that CAN pass through the membrane are SMALL:
Small enough to move through the lipids:
Carbon dioxide (CO2)
Oxygen (O2)
Larger or polar(ionic charge), but can use the protein channels to get through:
Sugars (glucose – C6H12O6)
Amino acids
Water (H2O)
Salt

19. Passive vs. Active

20. Solutions

21. Movement Across the Membrane
When do the molecules move?
When there is an unequal amount of solute and water on either side of a membrane

22. Types of Solutions