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Life and Cells
Transcript of Life and Cells
1. Characteristics of Life
2. Discovery of Cells & Cell Theory
3. Structure and Function of Cells
4. Cell Transport and Diffusion
Characteristics of Life
All living things...
Organelles are specialized structures that perform distinct processes within the cell
True or False
1. Nothing can enter or exit a cell.
2. Plant and animal cells are identical.
3. The nucleus contains DNA.
4. All cells contain Ribosomes.
5. Mitochondria create Energy for the cell.
6. It is impossible to look at a cell without
Made of Cells
Respond to Environment
If cells cannot typically be seen by the naked eye, how were they discovered?
Former Historical Ideas in Biology
The Slow Death of Spontaneous Generation
In 1838 German scientist
studied plant tissues
and proposed that all plants were made of cells.
In 1839, another German scientist,
Theodor Schwann concluded that all animals are made
Rudolf Vichow proposed that all cells come from cells.
Together these ideas make
Timeline of Microbiology
1644 Jan Baptist Van Helmont
1655 Robert Hooke
1668 Francesco Redi
1674 Van Leeuwenhoek
1745 John Needham
1768 Lazzaro Spallanzani
1774 Edward Jenner
1859 Louis Pasteur
1928 Alexander Fleming
All organisms are made of cells
All existing cells are produced by other living cells.
The cell is the most basic unit of life
First living microorganisms
Observed first cells and named them
Hypothesized that maggots do not spontaneously generate from meat
Supported Spontaneous Generation: Boiled chicken broth and noticed bacterial growth several days later
Repeated Needham's experiment but sealed the flask and created a vacuum. No bacterial growth but work was criticized.
Created the first vaccine for smallpox from Cowpox.
Finally discarded the notion of Spontaneous Generation with his award winning experiment with Swan neck flasks.
1. Why was Spallanzani criticized?
2. Why was Pasteur supported?
3. What are the differences and similarities between the three experiments?
Developed first antibiotic intended for human use, penicillin
How big is a cell?