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Test 2 Review
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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
Author
ZoeJane
ID
240412
Card Set
Test 2 Review
Description
Microbial Growth
Updated
10/13/2013, 10:53:31 PM
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