Module 4: Environmental Conditions For Bacterial Growth

Question 1

What is a cold loving bacteria called and what temp. range does it set between??

Answer 1

Psychrophilic - between 15-20 degrees Celsius best at 15degrees. Found in bottom of lakes, oceans, glaciers and fridge.

Question 2

What is the middle loving bacteria? What temperature range is it in?

Answer 2

Mesophilic- temps tyre between 25-40 degrees Celsius. These are most human pathogens, at about 37 degrees Celsius.

Question 3

What is the name of heating loving bacteria?

Answer 3

Thermophilic - ranges between 45-50 degrees Celsius. Found in hot tubs.

Question 4

What is minimum, optimum, maximum temperatures?

Answer 4

Min- lowest temp. at which a bacterial species will grow.
Optimum- temp. Giving the most luxuriant growth.
Max- highest temp at which bacterial growth will happen.

Question 5

What is a CO2 loving bacteria called and what are 3 ways that you can provide increasing amounts?

Answer 5

Capnophilic

1. Candle extinction jar
2. Chemical generation- gas pak (expensive)
3. CO2 incubator

Question 6

What are obligate aerobes and and obligate anaerobes?

Answer 6

Obligate aerobe- require O2 to growth.

Obligate a aerobe- grow in the absence of O2
eg. In the intestines

Question 7

What are facultative anaerobes?

Answer 7

Then are organisms that can grow without O2 but grow better with O2. These are most human pathogens. eg. Ecoli

Question 8

What are microaerophilic bacteria?

Answer 8

They require molecular oxygen for growth but at a lower concentration than that found in ambient air.