Chapter 8– A Tour of the Cell

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Presentation transcript:

Chapter 8– A Tour of the Cell

The Cell Theory Robert Hooke 1. All living things are made up of cells 2. All existing cells are produced by other living cells 3. Cells are the basic unit of life Anton van Leeuwenhoek Theodor Schwann Rudolf Virchow

All cells have 4 features in common: Plasma membrane / cell membrane DNA molecule Ribosomes (structure where proteins are made) Cytoplasm

All cells are divided into 2 groups: Prokaryote Cells Eukaryote Cells

Prokaryotic Cells

Eukaryotic Cells Animal Cells Plant Cells Fungus Cells Protist Cells

Most cells are microscopic but not all Bacterial cell Animal cell most bacteria 1-10 microns eukaryotic cells 10-100 microns micron = micrometer = 1/1,000,000 meter diameter of human hair = ~20 microns

So why do we study cells? Life is made up of cells (cell differentiation) cells  tissues  organs  systems

Cells have 3 main jobs: 1. make energy 2. make proteins need energy for all activities 2. make proteins proteins do all the work in a cell 3. make more cells for growth to replace damaged or diseased cells

How do we study cells? Microscopes!!! Light Microscope Compound Microscope Electron Microscope S.E.M. vs T.E.M.

Variations of the Electron Microscope SEM TEM

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