Transcript Discovering Cells

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