Cell Discovery and Theory

7.1

History o’ Microscope

•First magnifier created by using curved glass

•1590- Compound Microscope created

•Cells discovered

•1940s- Electron Microscope invented

•3d Images created

Cell Theory• 1800s, Scientists discover that plants and

animals have cells and are created by preexisting cells.

• Principles:

• All living organisms are composed of one or more cells.

• Cells are the basic unit of structure and organization of all living organisms.

• Cells arise only from previously existing cells, with cells passing copies of their genetic material on to their daughter cells.

Basic Cell Types• ALL cells have a plasma membrane

• Two categories of cells:

• Prokaryotic (pro kar ee AW tik)

• Eukaryotic (yew kar ee Aw tik)

• Eukaryotic Characteristics

• contain organelles and a nucleus

• Prokaryotic Characteristics

• cells without a nucleus and/or organelles