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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 theory2 Review How do microscopes work Apply Concepts What does it mean if a micrograph
is “false-colored”
CH 7 CELL STRUCTURE AND FUNCTION7.1 Life is Cellular
Robert Hooke 1665 used microscopes Looked in cork Used the word “cell.”
Anton van Leeuwenhoek Early master lens maker Made early microscopes Looked at pond water.
Cell Theory
1. The cell is the basic unit of life2. All living things are made up of at least one cell3. 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.
Stains and Dyes Increases contrast and
detail Can see more
organelles.
Transmission Electron Microscope (TEM)
Magnifies up to 1 million times
Shows internal structures
Specimen has to be dead.
Scanning Electron Microscope (SEM)
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
Eukaryote
Prokaryote
Prokaryotes
Lack nucleus Lack membrane bound organelles
Bacteria.
Eukaryotes
Have a nucleus Have membrane bound organelles
Everything but bacteria.
Nucleus
Contains the DNA Control center of cell.
Cell Membrane Plasma Membrane
Controls what goes in and out of cell Protective boundary Semi fluid
Similar to skin.