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Cell’s Alive
The history of the cell
• Exploring the cell…
A Time line
• 1665 Robert Hooke-looked at cork using one of the first
microscopes.
• Coined the term “cells”
1674 Anton van Leeuwenhoek – views tiny living organisms in pond
water.
1831 Robert Brown – discovered the cell’s nucleus
1838 Matthias Schleiden – concludes that all plants are made up of
cells.
1839 Theodor Schwann – concludes that all animals are made up of
cells
1855 Rudolph Virchow – proposes that all cells come from existing
cells
Cell Theory
• Completed in 1855
1. All living things are made of one or more
cells.
2. Cells are the basic units of structure and
function in living things
3. All cells come from other cells
Prokaryotes and Eukaryotes
• The two main cell categories
• Classified on whether they contain a
nucleus or not.
Prokaryotes
• Do Not contain a nucleus
• No membrane bound organelles
• DNA spread throughout the cell
• Contain a cell membrane
• Contain a cell wall
• Contain ribosomes
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Bacteria are prokaryotes
Label the prokaryote cell with the following
– DNA (nucleoid region), ribosomes, cell wall, cell membrane, flagella, pili
Images of Bacteria - Prokaryotes
Soil bacteria
Pseudomonas aeruginosa
E. Coli
Staphylococcus aureus
Eukaryotes
• Contain a nucleus
– Contains genetic material (DNA) inside.
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Contain membrane bound organelles
All have a cell membrane
Contain ribosomes
Some have a cell wall
Generally larger than prokaryotes
Eukaryote Cells
plant
Animal
Examples of eukaryotes
• Some Eukaryotes are single-celled organisms
Plants, animals, fungi and protists are examples of
multicellular eukaryotes.
Activity next slide
• Create a Venn diagram that compares and
contrasts Prokaryotic and Eukaryotic cells.
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Prok.
Eukary.