MCB4150 Exam 2 questions with
complete solutions passed
largest and most metabolically diverse phylum of bacteria
-facultatively aerobic, microaerophilic, and strictly anaerobic
-6 Classes: Alpha, Beta, Gamma, Delta, Epsilon, and Zeta - correct answer ✔✔ Proteobacteria
energy dependent movement of electrons against a thermodynamic gradient
-Redox reactions reversible in this case
-PMF powers the reversion
-Used by chemolithoautotrophs to generate reducing power to fix CO2 - correct answer ✔✔
Reverse Electron Flow
-AMO is in the membrane and oxidizes NH3 to NH2OH/hydroxylamine
-HAO is in the periplasm and oxidizes NH2OH/hydroxylamine to NO2- - correct answer ✔✔
What do AMO and HAO do?
ammonia-oxidizing bacteria and archaea
, -key enzymes are ammonia monoxygenase (AMO) and hydroxylamine oxidoreductase (HAO) -
correct answer ✔✔ Nitrosifying Bacteria
nitrite-oxidizing bacteria
-key enzyme is nitrite oxidoreductase to oxidize nitrite to nitrate
-is what TRUE nitrifiers do
-no known archaea does oxidation of nitrite to nitrate
-end product of nitrification is terminal e- acceptor for denitrification
-Alpa, Beta, Gamma, and Epsilon proterobacteria - correct answer ✔✔ Nitrifying Bacteria
re responsible for the removal and leaching of nitrogen fertilizers from agricultural systems -
correct answer ✔✔ What do nitrifying/nitrosifying bacteria and archaea do?
Winogradsky was observing Beggiota, and saw when they were deprived of H2S, they lost
sulfur-granules
-hypothesized that the sulfur-granules were energy reserves of oxidized H2S, used when the
nutrient was not available
-when sulfur-granules disappeared, they oxidized to SO4 2-, a soluble form
-are chemolithoauotrophic sulfur-oxidizing bacteria - correct answer ✔✔ Discovery of
chemolithotrophic bacteria
complete solutions passed
largest and most metabolically diverse phylum of bacteria
-facultatively aerobic, microaerophilic, and strictly anaerobic
-6 Classes: Alpha, Beta, Gamma, Delta, Epsilon, and Zeta - correct answer ✔✔ Proteobacteria
energy dependent movement of electrons against a thermodynamic gradient
-Redox reactions reversible in this case
-PMF powers the reversion
-Used by chemolithoautotrophs to generate reducing power to fix CO2 - correct answer ✔✔
Reverse Electron Flow
-AMO is in the membrane and oxidizes NH3 to NH2OH/hydroxylamine
-HAO is in the periplasm and oxidizes NH2OH/hydroxylamine to NO2- - correct answer ✔✔
What do AMO and HAO do?
ammonia-oxidizing bacteria and archaea
, -key enzymes are ammonia monoxygenase (AMO) and hydroxylamine oxidoreductase (HAO) -
correct answer ✔✔ Nitrosifying Bacteria
nitrite-oxidizing bacteria
-key enzyme is nitrite oxidoreductase to oxidize nitrite to nitrate
-is what TRUE nitrifiers do
-no known archaea does oxidation of nitrite to nitrate
-end product of nitrification is terminal e- acceptor for denitrification
-Alpa, Beta, Gamma, and Epsilon proterobacteria - correct answer ✔✔ Nitrifying Bacteria
re responsible for the removal and leaching of nitrogen fertilizers from agricultural systems -
correct answer ✔✔ What do nitrifying/nitrosifying bacteria and archaea do?
Winogradsky was observing Beggiota, and saw when they were deprived of H2S, they lost
sulfur-granules
-hypothesized that the sulfur-granules were energy reserves of oxidized H2S, used when the
nutrient was not available
-when sulfur-granules disappeared, they oxidized to SO4 2-, a soluble form
-are chemolithoauotrophic sulfur-oxidizing bacteria - correct answer ✔✔ Discovery of
chemolithotrophic bacteria
