THE STRUCTURE AND

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CHAPTER 4
All living things are composed of cells
THE STRUCTURE AND FUNCTION OF THE CELL
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LEEUWENHOEK

• 1600s
• simple microscope
• animalcules in pond water

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HOOKE

• 1665
• Plant stem
• Cork
• Cell

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BROWN

• 1828
• Nucleus

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SCHWANN

• 1839
• Animals are made of cells

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SCHLEIDEN

• 1839
• Nucleus is involved in cell reproduction

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VIRCHOW

• 1855
• Cells divide

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OTHER MICROSCOPES

• TEM TRANSMISSION
• ELECTRON
• - thin
• - 200,000 times
• SEM SCANNING
• ELECTRON
• - surface
• - 3-D
• - 100,000 times

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Cell Theory

1. Basic unit of life cells
2. All living things are made of cells
3. Cells come from pre-existing cells

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CELL SHAPES
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CELL SIZE

• http//www.cellsalive.com/howbig.htm

Cells are normally measured in micrometers.
Millimeters are often used for teaching purposes
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PROKARYOTIC CELL VS. EUKARYOTIC CELL
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Plant Cell Animal Cell
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CELL MEMBRANE
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FLUID MOSAIC MODEL OF THE CELL MEMBRANE
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PROTEINS

• Peripheral
• Integral
• Transport proteins
• Receptor proteins
• Recognition proteins

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CENTRIOLES
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RESPIRATION
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PLASTIDS Contain a double membrane and their own
DNA Examples amyloplast, chloroplast,chromoplast
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PHOTOSYNTHESIS
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CHLOROPLAST
Why leaves turn colors in the fall
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STOMATA
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What is cilia? What is flagella?