01 the discovery of cells
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A View of the Cell
The Discovery of Cells
The History of the Cell Theory
Anton van Leeuwenhoek (1600s) Advanced the microscope and used it to study
microscopic organisms “The father of microbiology”
Robert Hooke (1600s) Discovered and named ‘cells’
Matthias Schleiden (1830s) All plants are made of cells
Theodor Schwann (1840s) All animals are made of cells
The Cell Theory
All organisms are composed of one or more cells
The cell is the basic unit of structure and organization of organisms
All cells come from preexisting cells
The Compound Light Microscope – Convex
Lens
The Compound Light Microscope
~1500x magnification
To calculate magnification…
Find the magnification of each lens (objective and eyepiece)
Multiply the magnification of each lens
The Electron Microscope
Uses a beam of electrons in a vacuum to magnify up to 500,000x
2 types
Scanning Electron Microscope
Transmission Electron Microscope
2 Basic Cell Types
All cells contain small specialized structures called organelles
Many, but not all, organelles are surrounded by membranes
Organisms with cells that contain membrane bound organelles are called eukaryotes
Organisms without cells that contain membrane bound organelles are called prokaryotes
The Nucleus
Contains the DNA
Responsible for cell division
Manages and controls cellular functions