Bacterial Nutrition

Question 1

Cells need a source of…

Answer 1

Carbon
Nitrogen
Sulfur
Phosphorous
Oxygen (most but not all)
Hydrogen
Small amounts of trace elements

Question 2

Carbon sources

Answer 2

2 groups of organisms

• C from organic molecules > heterotrophs
• C from inorganic molecules > autotrophs

Question 3

Nitrogen source

Answer 3

Bacteria get N from ammonia (NH3) or nitrate (NO3-)

Question 4

Sulfur source

Answer 4

From sulfate: SO4(2-)

Question 5

Phosphorous source

Answer 5

From phosphates: PO4(3-)

Question 6

Hydrogen source

Answer 6

Water

Question 7

Oxygen Use Classifications

Answer 7

• Obligate Aerobes
• Facultative Anaerobes
• Aerotolerant Anaerobes
• Obligate Anaerobes

Question 8

SOD

Answer 8

-Superoxide Dismutase
-Oxygen is toxic to all organisms
-When O2 is dissolved in water: O2 –> O2(-)
-O2(-) is a superoxide (free radical)-
-SOD removes superoxides from the cell
O2(-) –SOD–> H2O2 –catalase–> H20 + O2
OR
O2(-) –SOD–> H2O2 –peroxidase–> H2O