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Cell Structure & Function Discovering Cells Chapter 1 Section 1.
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Cell Structure & Function Discovering Cells Chapter 1 Section 1
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Transcript of Cell Structure & Function Discovering Cells Chapter 1 Section 1.
Cell Structure & Function
Discovering Cells
Chapter 1
Section 1
Cells
• The basic units of structure and function in living things
First Sightings of Cells
• The invention of the microscope made it possible for people to discover and learn about cells
Compound Microscope
• A light microscope with more than 1 lens– Can magnify up to
10,000x• Good for…
– Cells
– Small Organisms
Robert Hooke
• 1663, English Scientist– 1 of the 1st people to observe cells
• Cork cells “Rectangular rooms”
Anton van Leeuwenhoek
• 1683, Dutch Businessman– Observed…
• Pond water– “Animalcules” little animals
• Teeth scum– bacteria
Cell Theory
• 3 Key Points…– All living things are
composed of cells– Cells are the basic unit
of structure and function in living things
– All cells are produced from other cells
Magnification
• The lens or lenses in a light microscope magnify an object by bending the light that passes through them– Convex lenses
Resolution
• The sharpness of an image
Electron Microscopes
• Use a beam of electrons to examine a specimen– Can magnify up to
1,000,000x• Good for…
– Viruses
– Bacteria
– Cell organelle
