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Chapter

BIOL107 Chapter Notes -Peptidoglycan, Cytokinesis, Endospore


Department
Biology (Biological Sciences)
Course Code
BIOL107
Professor
Lesley Harrington

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PROK CELL REPRODUCTION- MECHANISM
types mechanism result
BINARY FISSION 1. Growth, cell
doubles in
volume
2. Partitioning
using ParM
cells to form a
chain and move
each
chromosome set
to the ParS sites
(ends)
3. Cytokinesis
uses FtsZ
proteins to pull
insides of
cytoplasm in…
break large cell
in half.
2 identical daughter
DNA formed
Endosporulation
-Vegettive  endospore + fragment
-Used by Gram +
-Used by Gram – when lack of
nutrients
-Bacillus anthrasis makes a toxin!
Bacillus anthrasis (pathogenic) will
release 3 exotoxins when it
germinates its endospore… usually
inside people.
1. A larger
vegetative cells
will becomg
larger and form
1 endospore and
a dud
2. Asymmetrical
cell division
3. Survival
(withstand
extreme
temperatures)
4. Germinate when
conditions
improve
Layers of Endospore…
1. Cytoplasm fold
in.
2. Membrane is
isolated in shape
around one copy
of the DNA
3. Two membranes
surround DNA
4. Peptidoglycan
layer between
membranes
5. Spore coat
forms
6. Endospore
breaks free from
wall.
7. Rest of cell dies.
Budding; used for dispersal One daughter cell with
flagellum; produce
mobile offspring
Cell spreads and
reproduces thorough
different way;
Asexual reproduction means
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