bacteriology 1 Flashcards
what is taxonomy
biological classification
what is phylogeny
a comparative analysis of an organism on the basis of evolutionary relationship
what does the 16s rRNA sequence contain
variable and conserved regions
what are bacterial cell walls made of
peptidoglycan
what colour will gram-positive bacteria stain
purple
what colour will gram-negative bacteria stain
red
what is the difference between gram-positive and gram-negative bacteria
gram-positive bacteria have a thick cell wall and no outer membrane
gram-negative bacteria have a thin outer membrane and an outer membrane
what are archaea
microorganisms found in extreme enviroments
what features do archaea have
no peptidoglycan in the cell wall
lipids in the membrane
what type of archaea is thermophilic and hyperthermophilic
crenarchetoa
where is crenarchaetoa found
cool plankton waters
why is 16s rrna used as a marker
it is highly conserved
what indicates two organisms are the same species
97% same sequence for rrna
what is a methanogen
reduces co2 to ch4
what is a halophile
organisms that live in high salt environments
