The flashcards below were created by user
ZoeJane
on FreezingBlue Flashcards.
-
What is the wall called that separates the 2 halves of the dividing cell?
cross septum
-
Where does peptidoglycan synthesis start?
cyoplasm
-
Where does peptidoglycan synthesis end?
plasma membrane
-
What do you call a population of microorganisms growing in a closed culture vessel containing a single batch of medium?
batch culture
-
4 phases of bacterial growth
Lag, Exponential or log, stationary and death
-
A bacterial growth curve is plotte
logarithmically
-
What is balanced during the stationary phase?
cell division and cell death
-
In the batch culture what decreases over time and what increases?
Nutrients Decrease and wastes increase
-
What 2 things could be triggered by the starvation response?
endospore formation or formation of persister cells
-
Generation time
how much time it takes for bacteria to divide
-
binary fission
cells divide in 2 (log 2 or .301)
-
method of determining cell count involves a laser and fluorescently labeled antibodies
flow cytometry
-
hypotonic
water enters the cell cell swells and may burst
-
hypertonic
water leaves the cell, membrane shrinks from cell wall, plasmolysis occurs
-
osmotolerant
organisms grow over a wide range of water availability
-
acidophiles
grow from 0-5.5 pH
-
neutrophiles
grow from 5.5-8 pH
-
alkaphiles
grow from 8-11.5 pH
-
psychrophiles and psychrotrophs
like the cold
-
mesophiles
grow at 20-45 celcius
-
thermophiles
compost, hot springs
-
hyperthermophiles
grow at hot areas of ocean floor
-
microaerophiles
require oxygen at lower concentration than atmospheric levels
-
faculative anaerobes
don't require oxygen for growth yet grow better in presence of oxygen
-
aerotolerant anaerobes
grow equally well in the presence or absence of oxygen
-
Hydroxyl radical
is neutralized by super oxide dismutase (SOD), catalase and peroxidase
-
thioglycollate broth
contains a reducing agent to lower oxygen levels
-
barotolerant
organisms grow at extreme ocean depths
-
piezophilic organisms
grow at high pressure
-
radiation can result in
thymine dimers
-
biofilms
slime encased communities
|
|