Growth Phases of Micro-organisms

Question 1

Lag

Answer 1

-slow increase as cells adjust to conditions
-Induce required enzymes for substrates present

Question 2

Log/Exponential

Answer 2

-Cells grow at quickest possible rate
-Nothing limits growth

Question 3

Stationary

Answer 3

-No increase in numbers
-Reproduction=Death
-Less available resources
-Metabolites accumulate
-Secondary metabolites produced

Question 4

Death

Answer 4

-Culture is depleted
-Lack of substrate and build-up of toxic metabolites kills cells