Transcript 7.1_Life_is_Cellular

1 Review What is a cell
Explain What three statements make up the cell
theory
Infer How did the invention of the microscope help
the development of the cell theory
2 Review How do microscopes work
Apply Concepts What does it mean if a micrograph
is “false-colored”
CH 7 CELL STRUCTURE AND FUNCTION
7.1 Life is Cellular
Robert Hooke
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1665 used microscopes
Looked in cork
Used the word “cell.”
Anton van Leeuwenhoek
Early master
lens maker
 Made early
microscopes
 Looked at pond
water.
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Cell Theory
1.
2.
3.
The cell is the basic unit of life
All living things are made up of at least one cell
All cells come from other cells.
Compound Light Microscope
Light waves pass through
small organisms or thin
slices of larger ones
 Up to 1500 times
magnification
 Ours magnify 400 times
 Used to see bacteria
cells, and a few organelles.
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Stains and Dyes
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Increases contrast and
detail
Can see more
organelles.
Transmission Electron Microscope (TEM)
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Magnifies up to 1
million times
Shows internal
structures
Specimen has to be
dead.
Scanning Electron Microscope (SEM)
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Magnifies up to 1 million
times
Shows the surface of the
specimen
Used for cell surfaces,
organelle membranes,
viruses
Specimen may be living.
Cell Types
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Eukaryote
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Prokaryote
Prokaryotes
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Lack nucleus
Lack membrane bound organelles
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Bacteria.
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Eukaryotes
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Have a nucleus
Have membrane bound organelles
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Everything but bacteria.
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Nucleus
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Contains the DNA
Control center of cell.
Cell Membrane Plasma Membrane
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Controls what goes in and out of cell
Protective boundary
Semi fluid
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Similar to skin.
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