I and I Final Flashcards
Lag phase
initial phase characterized by cellular activity but NOT growth
cells increase in size but NO CELL DIVISION
Exponential (log growth) phase
cells divide by binary fission (double in numbers, metabolic high activity)
antibodies and disinfectants most effective in this stage
Stationary phase
of dividing cells are equal to the # of dividing cells
bacterial growth reaches a plateau
no overall population growth. number of diving cells equals the number of dying cells. no overall population growth
Death Phase
of dividing cells decreases exponentially
population grown experiences sharp incline
endotoxins
-gram neg
-LPS
- low dose = activate immune response and trigger fever
- high dose = extreme fever, septic shock, skin lesions (fatal)
exotoxins
- how bacteria causes disease
- release of exotoxins= polypeptides
- ## receptor binding protens that cause cell death or change in function
Transformation
introduction and expression of foreign genetic materials
conjugation
transfer of DNA via a plasmid from a donor cell to a recipient cell
transduction
bacterial DNA moved from one bacterium to another by a virus
gram neg or gram pos?
Thin peptidoglycan layer
gram neg or gram pos
Thick peptidoglycan layer
gram neg or gam pos
Do not retain crystal violet stain
gram neg or gram pos
Retains crystal violet stain
gram neg or gram pos
More resistant to antibodies due to cell wall
gram neg or gram pos
Develop resistance quickly
gram neg or gram pos
LPS that release endotoxins
Lytic
New virions are produced and bacterial cell lysis releases more bacteriophages. Includes a latent period between infection of the host cell and lysis. Results in cell death.
lysogenic
Viral DNA is incorporated into the host DNA. Involves a formant period where the host cell lives and does not show signs of infection. Allows the host cell to survive.
positive strand RNA
