Cell Theory: Life's Building Blocks
Understanding the Foundation of Life Grade 8 Science Discovering How All Living Things Are Connected
What Do You Think?
What do you, a tree, a butterfly, and bacteria all have in common? Think about the smallest parts that make up living things Share your ideas with a partner
What Are Cells?
The basic unit of life Smallest structures that can perform all life functions Like tiny factories with specialized parts All living things are made of one or more cells
Robert Hooke: The First Cell Observer
Used an early microscope in 1665 Looked at thin slices of cork Saw tiny box-like structures Named them 'cells' because they looked like monastery rooms
The Three Parts of Cell Theory
1. All living things are made of one or more cells 2. The cell is the basic unit of life 3. All cells come from existing cells
Unicellular vs. Multicellular Organisms
{"left":"Made of only ONE cell\nExamples: bacteria, amoeba, paramecium\nCell must do ALL life functions\nUsually microscopic in size","right":"Made of MANY cells\nExamples: plants, animals, fungi\nCells can specialize for different jobs\nCan grow to be very large"}
Cell Detective Challenge
Work in pairs to examine mystery images Decide if each organism is unicellular or multicellular Explain your reasoning using cell theory Present your findings to the class
Why Cell Theory Matters Today
Helps us understand diseases and how to treat them Guides medical research and drug development Explains how organisms grow and reproduce Foundation for biotechnology and genetic engineering
Key Takeaways
All living things are made of cells Cells are life's basic building blocks Understanding cells helps us understand life itself Cell theory connects all living things on Earth
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