growth curves Flashcards
1
Q
why are log scales used?
A
bacteria reproduce rapidly so large quantities can be obtained rapidly
2
Q
describe the first phase
A
lag
- constant line before increase
3
Q
describe the second phase
A
exponential
- increase
- reproduction at max rate
4
Q
describe the third phase
A
stationary
- constant population
- bacteria from growth and death are equal
5
Q
describe the fourth phase
A
death
- decrease
- bacteria death exceeds reproductive rate due to toxins or lack of resources
6
Q
how can death be prevented?
A
manipulating growth conditions
7
Q
state 5 limiting factors
A
- nutrients
- oxygen for aerobic respiration
- temperature to prevent enzyme denature
- remove toxins
- buffer pH
8
Q
how is the number of individial organisms calculated
A
initial x 2 (power divisions / generations)
9
Q
A
