Asked by ok
A student isolates an unknown bacterial sample from the bottom of a swamp area. The student discovers that this species of bacteria is able to live and grow in an oxygen-free environment, but it requires a nitrate-rich soil.
Which of the following respiration pathways is this species of bacteria most likely using?
A.
aerobic respiration
B.
anaerobic respiration
C.
ethyl alcohol fermentation
D.
lactic acid fermentation
All Answers 1
Answered by
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B. anaerobic respiration
Explanation: The bacteria grow without oxygen but require nitrate-rich soil, which indicates they use an alternative terminal electron acceptor such as nitrate (NO3–) for oxidative phosphorylation. That is characteristic of anaerobic respiration (e.g., nitrate reduction/denitrification). Fermentation pathways do not use inorganic terminal electron acceptors like nitrate.
Explanation: The bacteria grow without oxygen but require nitrate-rich soil, which indicates they use an alternative terminal electron acceptor such as nitrate (NO3–) for oxidative phosphorylation. That is characteristic of anaerobic respiration (e.g., nitrate reduction/denitrification). Fermentation pathways do not use inorganic terminal electron acceptors like nitrate.
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