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Germs (Bacteria (differentiate (morphology, size, shape, staining…
Germs
Bacteria
largest group of microorganisms
survive independently under wide range of environmental conditions
most = harmless / often beneficial
pathogens = cause harm = wounds / infections = cause various infections
differentiate
morphology
size
shape
staining characteristics
biochemical activities
cell wall structure
composition of RNA + DNA
classed as prokaryotic
organism lacks membrane bound nucleus
shape
coccus = spherical +round
cocky coccus
Bacillus = cylindrical + rod shaped
Basilisk Bacillus
spiral
spirlla = tightly coiled
spiral spirlla
Bacteria
Conditions
Temperature
Moister
pH level
oxygen
aerobic = oxygen
anaerobic = no oxygen
can live in either environment
Cell wall
semi rigid structure
determine shape of cell
mechanical support
stop cell from bursting exposed to osmotic pressure
nearly all = gram positive or gram negative
Positive
main component = thick layer of complex molecule = peptidoglycan
made of disaccharide molecule containing two glucose derivatives
N - acetylgucosamine
N - acetymuramic
Disaccharide molecule are cross linked by inter bridge = 4-5 amino acids
influence passage of materials in + out of cells = contribute to antigenic specificity of cell wall
Negative
more complex
thin layer of peptidoglycan
several function
prevent substance entering cell
prevent certain enzymes from breaking down cell wall
function
directly invade cell
reproduce within cell
burst = rupturing cell membrane
certain bacteria are attracted to certain body cells
use cell nutrients
kill host cell by breaking down membrane + spread to other parts of body