MIcrobiology Flashcards
how do bacteria multiply
binary fission
what is the name of the membrane that forms seperating two cells during binary fission
FtsZ ring
define coccus
bacterium that is spherical, ovoid or generally round
define bacillus
rod-shaped bacterium
spherelli
Spiral shape bacterium
what colour stain is gram positive
blue/purple
what does a gram positive stain indicate
thick peptidoglycan layer, teichoic acid present
what colour is gram negative
pink/red
what does gram negative indicate
thin/single layer peptidoglycan - lypopolysaccharides present
what is acid-fastness
physical property of certain bacteria allowing them to be resistant to colourising by acids - contain large amounts of lipid substances in their walls - myclolic acids
define fastidious
bacteria that have complex nutritionsl requirements
what are the three ways for gene transfere in bacteria
transformation, transduction, conjugation,
define gene transformation
free genetic material is taken up by the cell
define transduction
phage mediated transfere of non-phage DNA between bacteria
define conjugation
transere of DNA material via sexual pillius
