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Copyright Notice!
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Cell Structure
before nucleus
true nucleus
Comparing Cell Sizes
Mycoplasma 0.3-0.8 µm
E. coli 1x2 µm
Cyanobacteria 10 µm diam
Plant Cell 30x75 µm
Obviously eukaryotic
Nucleus present
Mitochondrion  Bacterium
Chloroplast  Cyanobacterium
Endosymbiosis: Eukaryotes are Chimeras!
Cell Theory
Theodor Schwann
Prussian Zoologist
Matthias Schleiden
German Botanist
1. All living organisms consist of one or more cells.
2. Some organisms are unicellular, so cells are the fundamental unit of life.
3. New cells come from pre-existing cells by cell division.
We can now add:
4. Cells must show all the properties of life.
5. All cells are basically similar in chemical and structural composition.
Eukaryotic Cell Structure
Middle Lamella-pectin glue
Cell Wall-cellulose+protein
Cell Membrane-phospholipid
-transport proteins
Cytosol-enzymes for
70S ribosomes
naked, circular DNA
70S ribosomes
naked, circular DNA
Vacuoletoxic waste
-import/export package
Golgi Apparatus
Nucleus-DNA linear
histone bound
-internal transport
80S Ribosomes
-protein synthesis
Other eukaryotic
organelles have
been omitted here!