MCB 4150 EXAM 1 & 2 QUESTIONS
Most prokaryotic cells reside: - Answer -in the oceanic and terrestrial subsurface
Of the following, which is the strongest oxidant (i.e. best electron acceptor)?
(Exam 1, q 2) - Answer -NO3-
-strongest oxidant= is reduced
-strongest reductant= is oxidized
-positive= is reduced
-negative= is oxidized
-electron donor= is oxidized
-electron acceptor= is reduced
In anaerobic respiration with nitrate (NO3-), the oxidation of which of the following
compounds would yield the most free energy?
(Exam 1, q 3) - Answer -H2
-greatest difference in reduction potential gives the greatest yield of energy
The microorganism catalyzing the following reaction is a:
NH3 + 1.5 O2 -> NO2- + H2O - Answer -chemolithoautotroph
-oxidizing inorganic compound NH3 (litho)
*Organic compound contains a C or bonded to a hydrocarbon
-obtains energy by oxidizing electron donors in environment (chemo)
-most lithotrophs are usually autotrophs
Transcription in ___ are more similar than the model found in the ___. - Answer -
Archaea and Eukarya; Bacteria
Which of the following statements about Sergei Winogradsky is false? - Answer -
Pioneer of pure culturing techniques
(Koch discovered it)
TRUE about Winogradsky:
-one of the first to examine elemental cycling by microbes
, -developed simple enrichment technique for aerobic/anaerobic microbes
-discovered chemolithotrophy
The Archaea were originally regarded as members of the Bacteria because - Answer -
all choices are correct:
-neither has membrane-bound compartments
-both typically contain a single circular chromosome
-neither has a nucleus
A fundamental difference between respiration and fermentation is that - Answer -there
is an external electron acceptor in respiration
-"external" because a compound other than the substrate accepts electrons
Martinus Beijerinck was the first to isolate - Answer -all choices are correct:
-sulfate-reducing bacteria
-green algae
-nitrogen-fixing bacteria
The "cohesive force" thought to hold bacterial and archaeal species together is -
Answer -periodic selection
-where on microbe persist with its adaptation, then it further diversifies again, holding
together a population within a niche
-survivor of each periodic selection brings it genome, including all genes that made it
able to occupy the niche
Which is one major difference between anaerobic and aerobic respiration? - Answer -
electron acceptor
-aerobic respiration usually uses O2 as the e- acceptor, because it makes the greatest
yield in energy with the largest difference in reduction potential from the e- donor
-anaerobic respiration can't use O2 as the e- acceptor
Which of the following statements about phylogenetic analysis of sequences is not
accurate? - Answer -character state methods are based on number of sequence
differences between a population of alleles
(analysis looks at molecular sequence data that was inherited by a common ancestor,
to establish positional homology, NOT sequence similarity)
Most prokaryotic cells reside: - Answer -in the oceanic and terrestrial subsurface
Of the following, which is the strongest oxidant (i.e. best electron acceptor)?
(Exam 1, q 2) - Answer -NO3-
-strongest oxidant= is reduced
-strongest reductant= is oxidized
-positive= is reduced
-negative= is oxidized
-electron donor= is oxidized
-electron acceptor= is reduced
In anaerobic respiration with nitrate (NO3-), the oxidation of which of the following
compounds would yield the most free energy?
(Exam 1, q 3) - Answer -H2
-greatest difference in reduction potential gives the greatest yield of energy
The microorganism catalyzing the following reaction is a:
NH3 + 1.5 O2 -> NO2- + H2O - Answer -chemolithoautotroph
-oxidizing inorganic compound NH3 (litho)
*Organic compound contains a C or bonded to a hydrocarbon
-obtains energy by oxidizing electron donors in environment (chemo)
-most lithotrophs are usually autotrophs
Transcription in ___ are more similar than the model found in the ___. - Answer -
Archaea and Eukarya; Bacteria
Which of the following statements about Sergei Winogradsky is false? - Answer -
Pioneer of pure culturing techniques
(Koch discovered it)
TRUE about Winogradsky:
-one of the first to examine elemental cycling by microbes
, -developed simple enrichment technique for aerobic/anaerobic microbes
-discovered chemolithotrophy
The Archaea were originally regarded as members of the Bacteria because - Answer -
all choices are correct:
-neither has membrane-bound compartments
-both typically contain a single circular chromosome
-neither has a nucleus
A fundamental difference between respiration and fermentation is that - Answer -there
is an external electron acceptor in respiration
-"external" because a compound other than the substrate accepts electrons
Martinus Beijerinck was the first to isolate - Answer -all choices are correct:
-sulfate-reducing bacteria
-green algae
-nitrogen-fixing bacteria
The "cohesive force" thought to hold bacterial and archaeal species together is -
Answer -periodic selection
-where on microbe persist with its adaptation, then it further diversifies again, holding
together a population within a niche
-survivor of each periodic selection brings it genome, including all genes that made it
able to occupy the niche
Which is one major difference between anaerobic and aerobic respiration? - Answer -
electron acceptor
-aerobic respiration usually uses O2 as the e- acceptor, because it makes the greatest
yield in energy with the largest difference in reduction potential from the e- donor
-anaerobic respiration can't use O2 as the e- acceptor
Which of the following statements about phylogenetic analysis of sequences is not
accurate? - Answer -character state methods are based on number of sequence
differences between a population of alleles
(analysis looks at molecular sequence data that was inherited by a common ancestor,
to establish positional homology, NOT sequence similarity)
