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Introduction To Cells
Cells are the basic unit of…
To see a cell, you must use a …
•Hans and Zacharias Janssen –
invented the first compound microscope
Common Microscopes
– Can look at magnified objects using light
– Can look at magnified objects in 3D using
electron beams
– Specimens must be covered in gold for image
to be captured
Occular Lens
Objective Lens
Light Source Knob
Discovery of Living Cells
– Cork Cells
• Anton van Leeuwenhoek
– Microorganisms in pond water
The Cell Theory
• All living things are made up of cells.
• Cells are the basic unit of life.
• All cells come from pre-existing cells.
Two Types of Cells
– No true nucleus – DNA is simply in a tangled
mess all over the cell
– Very few organelles
– Older than Eukaryote
– Nucleus – where DNA is kept – is bound
inside a membrane
– Many organelles
Side By Side
Two Types of Eukaryotic Cells
Plant vs. Animal Cells
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