The History of the Cell The Cell Theory

The History of the Cell & The Cell Theory

History of the Cell Theory Cells can not be seen with out help A microscope must be used to view cells The first microscope were a simple magnifying lens The most common microscopes used today are compound microscopes

What are Cells are the basic units of living things They can not be seen without a microscope The average cell is 0. 002 cm in diameter • Divide a cm into 1000 parts that’s how small • or 1/1, 000 of a meter

The Cell Theory Discovered in the early 1800’s Formed by 2 German Scientist Matthias Schleiden Thomas Schwann Composed of 3 main ideas

The Cell Theory 1. All organisms are composed of one or more cells 2. The cell is the basic unit of organization of organisms 3. All cells come from preexisting cells

Basic Cell Types Prokaryotic cell A cell type that lacks internal structures Usually only single celled organisms Eukaryotic cells are what make up most organisms Contain Organelles (cell parts) • membrane bound internal structure

The Eukaryotic Cell Composed of Organelles that control all the cells functions The Cell has a membrane that surrounds the cell The cell also has “a brain” or control center called the nucleus.

Types of Eukaryotic Cells The 2 major types of Eukaryotic cells are the Plant Cell Animal Cell

How do we see cells if they are so small Microscopes Simple – Magnifying glass Compound – • Compound Light – Compound means more than one – Uses 2 or more lenses to magnify an object Electron – • used to see individual molecules

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