The foul-smelling putrescine byproduct suggests activity of
A) amino acid fermentation by clostridia.
B) secondary fermentation.
C) sulfur-oxidizing bacteria.
D) syntrophic carbohydrate metabolism.
Which of the following reactions is classified as a heterofermentation?
A) hexose 2 lactate + 2 H+
B) HCOOH H2 + CO2
C) glucose lactate + ethanol + CO2 + H+
D) fructose 3 acetate + 3 H+
What would likely occur if an anammox bacterium was unable to use ladderane lipids?
A) Ammonium rather than ammonia would be used due to ammonia toxicity to other cellular processes.
B) It would require a different source for carbon assimilation.
C) Rates of anammox would be considerably slower due to a lack of localized metabolism.
D) Reactive nitrogen species would kill the cell.
Anammox is an anaerobic process that generates energy from ________ and forms N2.
A) ammonia
B) ammonium
C) ammonia and nitrate
D) ammonia and nitrite
Which of the following are NOT found within the photosynthetic gene cluster of Rhodobacter (a purple phototrophic bacterium)?
A) genes encoding reaction center and light-harvesting photocomplexes
B) genes encoding proteins involved in phycobiliprotein biosynthesis
C) genes encoding proteins involved in bacteriochlorophyll biosynthesis
D) genes encoding proteins involved in carotenoid biosynthesis
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