1. Topic Three: The Cell and its structures
Multi – cellular - organisms that have two or more cells.
Uni – cellular - organisms that have only one cell.
Ex. Euglena, Paramecium, Diatoms.
Most make their food by photosynthesis

2. Cell Parts
All structures inside a cell, (animal or plant), are called organelles.
Cell Structures (Animal and Plant)
Cell Membrane
Surrounds the cell
Controls the movement of the substances
Cytoplasm
Like jelly, constantly moving
Moves oxygen and food to different parts of the cell

3. Nucleus
Easiest to see under a microscope
Controls the cell
Holds chromosomes, (genetic material)
Surrounded by a nuclear membrane
Vacuoles
Inside the cytoplasm
Store extra food, wastes, and other substances

5. Cell Structures (Plant ONLY)
Cell Wall
Made up of cellulose
Supports the cell shape
Chloroplasts
Where photosynthesis takes place
Contain chlorophyll which absorbs sunlight

7. Cell Size & Function
Cells are small because they need a constant supply of energy, (food/oxygen), to survive. The bigger the cell the more energy required.
For an organism to grow, the cells stay the same size just increase in number, (more are produced).