 1595 - Developed the first
compound microscope
 Allowed for greater magnification
 1665 – Looked at cork under a
microscope.
 First to use the term “cells”
 Looked like tiny cells/rooms in a
monastery.
 1674 – Discovered tiny organisms
living in water. “animalcules”
 Tiny organisms exist that we
can’t see.
 Even in the water we drink.
 1838 – Determined plants are
made of cells.
 1839 – Determined animals are
made of cells.
 1855 – All cells come from
other existing cells
 All living things are made of
cells.
 Cells are the basic units of
structure and function in living
things.
 New cells come from other cells.
The Weird History of Cell Theory
Prokaryote
Eukaryote
1)
Means “before nucleus”
2)
All single celled
organisms
3)
DO NOT have a nucleus
to contain their DNA
4)
Very few internal
structures
5)
All bacteria are
prokaryotes
1)
Means “true nucleus”
2)
Have a nucleus
3)
Complex structure –
many internal structures
(organelles)
4)
Can be a single cell or
multicellular organisms
5)
All animals and plants
are Eukaryotes
1)
They have a Cell
Membrane
2)
Contain DNA
3)
They show all
characteristics of life
All Cells
Prokaryotes
Bacteria
Eukaryotes
Plant
Animal
 During the 14th century, 25 % or ¼ of Europe was killed
by a bacteria (25 million people)
 Yersinia pestis or Pasteurella pestis
 Bubonic Plague, also called Black Death
 This bacterium was spread through fleas and rodents
Bubonic Plague - Black Death
 Cells fall into two broad categories, depending whether
they contain a nucleus
 Nucleus (plural: Nuclei)
 A large membrane-enclosed structure that contains the cell’s
genetic material in the form of DNA
 Controls many of the cell’s activities
 Eukaryotic Cells
 Prokaryotic Cells