Sturcture & Classification Of Bacteria Flashcards
What is a bacterium ?
Microscopic single celled organism of the kingdom Monera thick possesses a non-compartmentalized cell structure and a non membrane bound nucleus
What is CONSORTIA
a useful survival technique of PROKARYOTES where they have an arrangement in which the physiological characteristics of different organisms contribute to the survival of the group as a a whole
What is Quarom Sensing
Cell-to-cell communication to regulate the transcription of genes involved in diverse physiologic processes that ensure the production of one or more diffusible signal molecules termed AUTOINDUCERS/PHEROMONES that enable bacterium to monitor its own cell population density.
Prokaryotes can exchange small pockets of genetic information carried on
Plasmids
*small & specialized genetic elements that are capable of self replication
Concern ?
Carriage of genes that code for antibiotic resistance
Mycoplasmas
Parasitic prokaryotes that have lost the ability to form a cell wall
Incorporate substantial qtty of cholesterol into cell membrane from the host
Classification of prokaryotes
1) spore forming & non spore forming
2) lactose fermenting & non lactose fermenting
3) Gram negative & Gram positive
Classify bacteria
*shape - bacilli & cocci
*O2 utilization- Aerobic & anaerobic
*locomotion - motile & non motile
*nutrition - fermenters & nonfermenters
*temperature preference - Psycrophiles(cold), Mesophiles (moderate heat), Thermophiles (heat loving)
Where do prokaryote package their DNA
The nucleoid
*have no true nuclei
Characteristics of prokaryote cell structure?
1) no true nuclei
2) absence of nuclear membrane/apparatus
3) lack autonomous plastids
4) have photosynthetic pigments (carotenoids, Bacterio chlorophyll)
Prokaryotes distinguished from Eukaryotes by _
Presence of sterols
*except mycoplasmas that incorporate sterols such as cholesterol into their membrane
Prokaryotic cell membrane functions
1) semipermeable
2) protein & isownzyme secretion
3) biosynthesis
4) electron transport
5) chemotaxic system
What is responsible for the tensile strength of the cell wall
Murcin/mucopeptide/peptidoglycan
_ is responsible for the non specific endotoxin activity of gram negative bacteria
Lipopolysaccharide of Gram Negative cell wall
Who invented the Gram Staining procedure
Hans Christian Gram
What is used to wash bacteria in Gram stain
Alcohol or Acetone
_ cell wall takes up more of the primary stain
GPB cell wall
_ cell wall takes up more of the primary stain
GPB cell wall
Quorum sensing ?
A cell-to-cell communication to regulate the transcription of genes involved in diverse physiologic processes that ensure the production of one or more diffusible signal molecules termed autoinducers or pheromones that enable bacterium to monitor its own cell population density.
Prokaryotes have the ability to exchange small pockets of genetic information carried on _
Plasmids (small, specialized genetic elements capable of self-replicable)
