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7-1
1. Cell Theory2. Prokaryotes vs. Eukaryotes
How were cells discovered?The first cell was discovered when Robert
Hooke looked at cork under a microscope!He saw thousands of tiny empty chambers
History of the Cell
1838:Schleiden
concludes that plants are made of
cells
1665: Hooke
discovers the cell
1839: Schwann concludes that
animals are made of cells
1855:Virchow proposes that all cells come from other cells
completing the cell theory
1674: Van Leeuwenhoek observed tiny
living organisms in pond water
Cell Theory
1. All living things are made of cells.
2. A cell is the smallest unit of life.
3. All cells come from preexisting cells.
Prokaryotic Cell (bacteria)
Cell membrane
Cell membrane
Cytoplasm
Cytoplasm
Organelles
Eukaryotic Cell(plants and animals)
Prokaryote vs. Eukaryote
Nucleus
Prokaryotes
Unicellular (Single celled) No nucleus- DNA is located in the
cytoplasm in a simple circle
www.blobs.org/science/cells/prokaryote.gif
Eukaryotes
Contain organelles Often multi-cellular DNA is found chromosomes located
inside the nucleus
These are the cells that YOU have!
Organelle
What is an organelle?A membrane bound structure that
separates cell functions Found in Eukaryotic cells“little organ”
2 Basic Cell Types
Prokaryotes Eukaryotes
Prokaryotes vs. Eukaryotes
Prokaryotes Eukaryotes
Cell membraneContain DNARibosomes
NucleusEndoplasmic
reticulumGolgi apparatus
LysosomesVacuoles
MitochondriaCytoskeleton