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Transcript
Introduction To Cells
Cells are the basic unit of…
LIFE
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
Arm
Course
Knob
Objective Lens
Stage
Fine
Light Source Knob
Base
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
http://whyfiles.org/course/pp123/lesson_1/images/prokaryote(bacteria).jpg
http://www.blobs.org/science/cells/eukaryote.gif
Two Types of Eukaryotic Cells
http://www.dyrevern.no/images/251/storfe_kuer_1.jpg
http://jquery.com/demo/thickbox/images/plant4.jpg
Plant vs. Animal Cells
http://micro.magnet.fsu.edu/cells/plants/images/plantcell450.jpg
http://www.uvm.edu/~inquiryb/webquest/fa06/mvogenbe/Animal-Cell.jpg
Please Watch