Organic Growth Factors & Oxygen

Question 1

What are Organic Growth Factors that are a Chemical Requirement for Microbial Growth?

Answer 1

Vitamins

Question 2

Why is Oxygen so essential for Life?

Answer 2

It is the Terminal Electron Acceptor in the production of ATP

Question 3

What are the 5 Categories of Bacteria based on their use or survival in the presence of Oxygen?

Answer 3

Obligate Aerobes
Facultative Anaerobes
Obligate Anaerobes
Aerotolerant Anaerobes
Microaerophilic Aerobes

Question 4

-Only Aerobic Growth
-Oxygen Required
-Growth Occurs where Oxygen [ ] is High
-Catalase & SOD

Answer 4

Obligate Aerobes

Question 5

-Aerobic & Anaerobic Growth
-Greater growth in the presence of Oxygen
-Growth is best where Oxygen is present but occurs throughout the tube
-Catalase & SOD

Answer 5

Facultative Anaerobes

Question 6

Why are forms of Oxygen (other than O2) devastating to bacteria?

Answer 6

Oxidizes DNA and Proteins

Question 7

-Only Anaerobic Growth
-Growth stops in the presence of Oxygen
-Growth occurs only where there is no Oxygen
-Lack Neutralizing Enzymes (Catalase &
SOD)

Answer 7

Obligate Anaerobes

Question 8

-Only Anaerobic Growth
-Growth Continues in the Presence of O2
-Growth Occurs Evenly
-Oxygen has no effect
-SOD partially neutralizes Harmful forms of Oxygen

Answer 8

Aerotolerant Anaerobes

Question 9

-Only Aerobic Growth
-Oxygen Required in LOW concentration
-Growth only in areas of LOW concentration
-Produces Lethal Amounts of Toxic Forms of Oxygen if exposed to normal atmospheric Oxygen

Answer 9

Microaerophilic Aerobe