Uploaded by Alexandra Sevenz

Microbiology MODULE 2

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BACTERIA EARCHEA
howtheydifferfromeukaryotes
DNA ispackaged
The
way
materialfreein cell no reveled
themakeupofcell wall
abacteriahave
sturdycell walls madeofchemicalcalledpeptidoglycan
arched walls alsotough
theirinternalstructures
theydon'thavecomplexmembraneboundorganelles eukaryotesdo
manybacteriafunction as single celledorganism
EXTERAL STRUCTURES
appendages provide motility AND enable adhesion
motility flagella axialfilaments
Adhesion fimbria pili nanotubes
motility abilityof
all to swim
freelythroughaqueusen
flagella
3 distinct partsofflagella
I hook 2 fellament 3 basal
body
chemotaxis flagellasbehavior to move in
response to chemicalsignals
main functionof
nanotubes
transfer amino acid or electronsto eachother
mmmm
in effort to harvest energy
coating for protection and
glycoryn developers as aadhere
sometimes helps cells
to environment
THE CELL ENNALOPE THEwallismembrane
The cellenvelope is thefoundryof a bacterium
The cell wall consistsof 2 3 basiclayers
1 The cell wall 2 cytoplasmicmembrane 3 bacteria
The Cell Wall
in bacteria
structure made ofpeptidoglycan
ridged
liesjust outsidethecytoplasmicmembrane
a
gram negative gram positive cell walls
The grampositive cell wall
Think
includes boundpolysaccartes tuchoveacid and
lepoticchoicacid
These maintain cell wall enlargement
Thegramnegative all wall
Thin
single sheet of peptidoglycan
Thegramnegative outer membrane
possessed bygramnegative bacteria
lies outside cell wall
lipid belayer wi specialisedproteinsÉpolysacs
The
membrane
Cytoplasmic
a lipid
bilayer wi embeddedprotons
structure
primarilyphospholipids proteins
THE BACTERIALINTERNALSTRUCTURE
Contentsof the cell cytoplasm
cytoplasm ageletonssolutionencasedbycytoplasmic
membrane
it'smajorcomponent is water 70 80 which
serves as a solvent for all contents which is
a complex mixture of nutrients sugars amino
Acids and salts
endospores dormant bodies produced by bacteria
exist in formof a vegative all or an endospore
a vegetative cell is growing É actor
challenging factor
gets
will form endospores in process called
sporulation
when environment
THE ARCHE A
Aphsychrophilic archer that
at
very
are adaptedto growth
low temperatures
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