Test 2 Review
Card Set Information
Test 2 Review
What is the wall called that separates the 2 halves of the dividing cell?
Where does peptidoglycan synthesis start?
Where does peptidoglycan synthesis end?
What do you call a population of microorganisms growing in a closed culture vessel containing a single batch of medium?
4 phases of bacterial growth
Lag, Exponential or log, stationary and death
A bacterial growth curve is plotte
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
how much time it takes for bacteria to divide
cells divide in 2 (log 2 or .301)
method of determining cell count involves a laser and fluorescently labeled antibodies
water enters the cell cell swells and may burst
water leaves the cell, membrane shrinks from cell wall, plasmolysis occurs
organisms grow over a wide range of water availability
grow from 0-5.5 pH
grow from 5.5-8 pH
grow from 8-11.5 pH
psychrophiles and psychrotrophs
like the cold
grow at 20-45 celcius
compost, hot springs
grow at hot areas of ocean floor
require oxygen at lower concentration than atmospheric levels
don't require oxygen for growth yet grow better in presence of oxygen
grow equally well in the presence or absence of oxygen
is neutralized by super oxide dismutase (SOD), catalase and peroxidase
contains a reducing agent to lower oxygen levels
organisms grow at extreme ocean depths
grow at high pressure
radiation can result in
slime encased communities