Students Will: summarize the contributions scientists have made toward the cell theory state the cell theory.

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Students Will: summarize the contributions scientists have made toward the cell theory state the cell theory.
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Students Will: summarize the contributions scientists have made toward the cell theory state the cell theory.

Early Scientists’ Contributions

Robert Hooke Coined the term “cell”

Anton van Leeuwenhoek First compound light microscope

Matthias Schlieden All plants are made of cells

Theodor Schwann All animals are made of cells

Rudolf Virchow Cells can only arise from pre-existing cells

Cell Theory The cell is the basic unit of life. All living things are made of one or more cells. All cells arise from pre-existing cells.

Prokaryote vs. Eukaryote Prokaryotes= Cells WITHOUT a cell nucleus DNA floats freely in the cell BACTERIA are prokaryotes (and are very tiny) Eukaryotes= Cells WITH DNA organized into cell nucleus All plants and animals are eukaryotes MUCH larger than tiny prokaryotes

Cell Differentiation: Differentiation: cells becoming specialized to perform different jobs Stem cells: Cells that have NOT differentiated yet (can become anything)

Cells have “little organs” called- ORGANELLES! (See cell organelle assignment for their functions)

Questions... Who used the first microscope? Who said that plants were made of cells Who coined the term “cell”? Who said that all animals were made of cells? Who said that cells must come from existing cells?

State the cell theory... ALL organisms are made of one or more cells. The cell is the basic unit of structure and function in an organism. All cells arise from pre-existing cells.

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