Lecture 6

Question 1

What are the physical and chemical growth requirements for microbes?

Answer 1

Physical- Temp., pH, Osmotic Pressure, Hydrostatic Pressure
Chemical- carbon (DNA, proteins, carbohydrate, fat)
-nitrogen, phosphorous, and sulfur (DNA/protein)
-trace elements (chemical reactions & enzyme co-factors)
-oxygen (energy production/respiration)

Question 2

How will microbial growth be affected if *Temperature increases or decreases? Think about the protein and Lipids

Answer 2

( Protein:) 
High Temp= denatures protein 
Low Temp= reduces protein activity 
( Lipids: )
Low Temp.= become rigid and fragile 
High Temp= become too fluid and cannot contain the cell or organelle

Question 3

Psychrophile, Mesophile, Thermophile and Hyperthermophiles is in which classification based on its optimum growth?
A- PH
B-Osmotic Pressure
C-Temperature

Answer 3

C-Temperature

Question 4

Which of the following would be seen at optimum growth temperature ( 35’C-41’C) for microorganisms that typically grow abundantly around humans
A- Psychrophile
B- Mesophile
C-Hyperthermophiles

Answer 4

B- Mesophile

Question 5

Which of the following is a Cold-loving Microbe. Typically in (-4’C) - (20’C). Optimum growth temperature 10 degrees C . Found in arctic
A- Psychrophile
B- Mesophile
C-Hyperthermophiles

Answer 5

A- Psychrophile

Question 6

Which of the following lives in warmer temp and the Optimum growth is around 65’C . Found in Hot springs such as Yellowstone National Park
A-Thermophile
B- Mesophile
C-Hyperthermophiles

Answer 6

A-Thermophile