The Cell Theory SOL BIO 2a

The Cell Theory  The development and refinement of magnifying lenses and light microscopes made the observation and description of microscopic organisms and living cells possible.

The Cell Theory  Many scientists contributed to the cell theory

Microscope/Leeuwenhoek image: Animation from: ___________________________________ a Dutch microscope maker was the first to see LIVING ORGANISMS in pond water. Anton van Leeuwenhoek

Microscope image: Cork image: Hooke image: ______________________ used a microscope to examine a thin slice of cork and saw “little boxes” He called them “CELLS” because they looked like the small rooms that monks lived in called Cells Robert Hooke

Plant image: Schleiden image: German botanist __________________________ concluded that ALL PLANTS are made of cells Matthias Schleiden

Schwann image: Animals image: German zoologist _________________________ concluded that ALL ANIMALS ARE MADE OF CELLS Theodor Schwann

Virchow: Mitosis: German medical doctor _____________________ saw dividing cells in the microscope and reasoned that cells come from other cells Rudolph Virchow

CELL THEORY 1. All living things are ________________________. 2. Cells are the basic unit of ____________ & _____________ in an organism. (cell = basic unit of _____________) 3. Cells come from the reproduction of ____________ cells Cell image: MADE OF CELLS other life STRUCTURE FUNCTION

The Cell Theory  Continued advances in microscopy allowed observation of cell organelles and structure.

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Left Hand Assignment pg. Draw a picture to represent each part of the cell theory

The Discovery of Cells before nucleus true nucleus

The Discovery of Cells Two basic types of cells Prokaryotes Prokaryotes - cells with no nucleus or membrane bound organelles Eukaryotes Eukaryotes – cells with a nucleus and membrane bound organelles

ProkaryoticEukaryotic

ProkaryoticEukaryotic Ribosomes (red)

ProkaryoticEukaryotic Ribosomes (red) Nucleus (black)

ProkaryoticEukaryotic Ribosomes (red) Nucleus (black) Cytoplasm (yellow)

ProkaryoticEukaryotic

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Prokaryotic / Eukaryotic Venn Diagram Pg. 78

PROKARYOTIC BOTH EUKARYOTIC Nucleus DNA Bacteria Cytoplasm Ribosomes Complex Basic Oldest Small Organelles Large Cell Membrane