2.6 Flashcards
(7 cards)
1
Q
Three domains of life?
A
Archaea, bacteria, some eukaryotes
2
Q
Conditions needed for micro organisms?
A
•Sterility
•Control of temperature
•Oxygen levels
• pH
3
Q
Why are sterile conditions needed?
A
•reduce competition
•reduce spoilage
4
Q
A growth media will
A
Provide the micro organisms with raw materials for biosynthesis as well as an energy source
5
Q
Phases of growth media
A
•Lag phase - enzymes are induced to metabolise substrates
• log phase- most rapid growth of microorganisms due to plentiful nutrients
•Stationary phase - nutrients become depleted and production of toxic metabolites
•death - toxic accumulation of metabolites
6
Q
Viable cell counts
A
Counting ONLY living micro organisms
(Show a death phase where numbers are decreasing)
7
Q
Total cell counts
A
Viable and dead cells
