1. Lesson 25 Cells
Subtitle

2. ACTIVATOR
Review
List an organism and the eight characteristics of life it has
List a non living thing and list the characteristics of life it lacks
Question of the day: Are viruses alive? Explain.
The Debate
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3. Cells Basic unit of life
Form parts of an organism to carry out processes or functions
Functions include:
Breathing, getting rid of waste, eating, growing, etc
One square centimeter of skin contains 100,000 cells
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4. First Observations of Cells
1590 microscope was made
Robert Hooke 1660 built better compound microscope
first to observe cells
Looked at a thin slice of cork (bark of an oak tree)
Anton van Leeuwenhoek
Looked at swamp water and teeth scrapings
Saw small moving organisms
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5. The Cell Theory states:
Schleiden, Schwann, Virchow helped developed THE CELL THEORY
The Cell Theory states:
All living things are composed of cells
Cells are basic unit of structure and function in living things
All cells are produced from other cells
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6. Tiny structures inside the cells are called organelles
Looking inside Cells
Tiny structures inside the cells are called organelles
Organelles carry out specific functions
Two types of cells
Prokaryotic
Eukaryotic
Plant and Animal
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7. Work in pairs to complete the article about the Cell Theory
Classwork
Work in pairs to complete the article about the Cell Theory
30 minutes then we will review as a class
Keep the volume down, please and thank you
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