Lecture 7

Question 1

How is growth measured in bacteria?

Answer 1

Growth is measured through the number of cells that bacteria create and not the size to grow at.

Question 2

what features do a bacterial generation length of time depend upon?

Answer 2

• level of acidity(pH)
• Temperature
• level of osmotic pressure
• Water
• Amount of nutrients

Question 3

What type of growth do bacteria undergoe?

Answer 3

Bacteria undergoe exponential/logarithmic growth.

Question 4

What are the 4 phases of bacterial growth

Answer 4

1) lag phase: Beginning bacteria begin to adust to stress conditions, turn on and off genes, and convert from a vegatative cell to a spore.
2) Optimal phase: This is the exponential part where bacteria have enough nutrients and are thriving
3) Stationary Phase:
This when the nutrients bacteria need are becoming exhausted and the waste released from bacteria are building up.
4) Death decline phase: This is when nutrients have been completly exhausted and the most waste has been built up.