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Primitive Cells
I.
Prokaryotes
A.
No cell compartments
B.
No nucleus – DNA not contained within a
membrane
C.
All are unicellular organisms
E.g. bacteria
II. Bacteria
A.
Prokaryotic cells (no nucleus)
B.
Have cell membrane, cytoplasm,
cytoskeleton, & ribosomes
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C.
Also have :
1. Cell wall
2. Flagella
3. Pili
D.
Bacterial cell walls
1. Made of sugars linked together
2. Cell wall structure determines what kinds
of cells bacteria can interact with
3. Structure of bacteria cell wall used to
classify bacteria
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E.
Flagella – long whip-like hair
F(x) = locomotion
F.
Pili – used for sexual reproduction
G.
Ecological Roles of Bacteria
1. Nitrogen Cycle & Decomposition
2. Food manufacture (E.g. cheese, yogurt,
pickles)
3. Medicine manufacture (penicillin,
insulin, growth hormones)
4. Pathogens – cause diseases
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