1. Unicellular and Multicellular Organisms

2. Unicellular Organisms
Most are microscopic
Examples: Amoeba, Paramecia, E. Coli
Perform the same tasks as multicellular organisms
They move, eat, reproduce and expel waste.

3. THE AMOEBA

4. Binary Fission (cell division)
                                                                                                                                                               
                    
          
Binary Fission (cell division)
PARAMECIA

5. The Amoeba Have characteristics of an animal cell
Live in fresh and salt water environments and decaying vegetation sites.
Are predators – they prey on algae and bacteria
Uses osmosis to get water and diffusion to get oxygen and dispose of carbon dioxide.

6. Multicellular Organisms
Rely on a variety of cells to perform cellular functions. These are called “specialized cells”.
Specialized cells perform duties such as digestion or movement.
Example: Eyes, Muscles and Tongue. (what duties do these perform?)
Cells can be compared to small cities. Each one performs a different job/function. They all work together to be efficient. Just like we need specialist doctors, cells need specialist cells.

7. Question to Consider
Why do you think small cells are more efficient than large cells?

8. Cellular Process in Plants and Animals
Materials enter cells through diffusion and osmosis
Cells break down materials and convert them to energy, to transport energy from one place to another, to build protein and send chemical messages.
Cells also expel waste products. The higher number of cells, the more waste that is expelled.

9. Energy
Energy is necessary for digestion, transport, reproduction and repairing damage to cells
In animal cells, the mitochondria are responsible for breaking down carbs and releasing energy.
Specialized cells like liver and muscle cells have more mitochondria than other cells in the animal system. Why do you think this is?
In plant cells, chlorophyll convert energy to sugars using water, carbon dioxide and nutrients.

10. Processing and Transporting
Main Cell Parts: Cytoplasm, Endoplasmic Reticulum, Golgi Apparatus, Lysosomes
Materials move through the cytoplasm
The Endoplasmic Reticulum creates protein from the materials and passes them to the Golgi Apparatus
The Golgi apparatus processes the protein and secretes them outside the cell to be used in other places.
Lysosomes break down food and digest waste.

11. Reproduction
Cells have a life span. Amoeba live for approximately 2 days.
Brain cells: yrs
Red Blood Cells: 120 days
Skin Cells – 20 days
New cells are created through cell division, when one cell splits into two. First the nucleus splits, and then the remainder of the cell.
The two new cells are identical.
In plant cells, the nucleus divides and then a new cell wall is created.

12. CELL DIVISION

13. Do you Get It? Consider the following question:
A unicellular organism is a living thing that meets all of the basic needs with just one cell. A multicellular organism can require up to several trillion cells to do the same thing. Which do you consider to be more advanced? Explain your reasoning.