cell and germ theory

what were the two scientists involved with the cell theory

Theodor Schwann

Matthias Schleiden

when was the cell theory proposed originally

late 1830s

what are the three main principles of the cell theory

1. cells are basic units of life

2. all living things are made up of cells

3. all cells come from other cells

who added the 4th principle of cell theory

Rudolf Virchow

what is the 4th principle of the cell theory

cells carry genetic material passed to daughter cells during cellular division

what are some of the old beliefs with becoming ill/ catching a disease

foul odors and “evil spirits”

in the late 19th century, … established that a particular germ could cause a specific disease

Robert Koch

what animal was Robert Koch working with

anthrax in infected mice (injected with blood from anthrax-infected cows)

what are the 4 specific criteria of the germ theory

1. germs can be found in affected people but not healthy individuals

2. germs can be grown from affected people

3. introducing a germ to a healthy test subject will cause the same disease

4. the germ can be re-isolated from the test host