all living things are made of cells. cells are the basic unit of structure and function in living...
TRANSCRIPT
All living things are made of cells. Cells are the basic unit of structure
and function in living things. New cells are produced from existing
cells.
Anton van Leeuwenhoek Dutch Businessman 1600’s Invented first powerful microscope
(300X) Examined pond water Saw “little animals”
Simple Microscope-1 lens. Ex. Magnifying lens
Compound Light Microscope- uses light and many lenses to view small objects. Ex. *Our Lab*
1.) Body Tube- tube of mirrors connecting objective lens and eyepiece2.) Revolving Nosepiece- moves lens into place3.) Low Power Objective- 4x or 10x; locates specimen4.) Medium Power Objective- 10x; locates specimen5.) High Power Objective- 40x; greater magnification
6.) Stage Clips- holds slides in place 7.) Diaphragm- controls the amount of
light 8.) Illuminator/Light- 9.) Eyepiece (Ocular Lens)- piece you
look through, magnifies 10 times (10x) 10.) Arm- supports body tube
11.) Stage- holds the slideStage Opening- circle where light passes
through 12.) Coarse Adjustment- used for FIRST
focusing, moves body tube 13.) Fine Adjustment- sharpens image,
final focusing 14.) Base- bottom
Slide- holds the specimen (glass or plastic)Slide Cover- covers specimen so it doesn’t move Lens Paper- cleans lenses
Put slide under stage clips. Focus using low power (4X). Coarse ->
Fine Switch to higher power (10X or 40X). *ONLY USE FINE ADJUSTMENT ON 40X
LENS!
Cell Membrane- ALL cells are surrounded by a thin flexible barrier.
Nucleus- Large membrane enclosed structure that contains genetic material in the form of DNA and controls many of the cells activities.
Prokaryotic Eukaryotic
Simple Complex
Unicellular Mostly Multicellular
No Nucleus Nucleus
No Organelles Organelles
First Cells on Earth
Ex. Bacteria Ex. Plant & Animal Cells