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You have collected samples from mud at the bottom of a nearby pond and have isolated different bacteria and protists from that community. You put the cultures in appropriate media in test tubes with loose-fitting lids and leave for the night, confident that your cultures will be growing well when you return.
-Test tube B has a strong smell of rotten eggs. This culture must contain
A)obligate aerobes.
B)obligate anaerobes.
C)facultative anaerobes.
D)sulphate-reducing bacteria.
E)fermenting organisms.

Question

Quizplus · Accepted Answer

The strong smell of rotten eggs indicates the presence of sulphate-reducing bacteria which produce hydrogen sulphide gas as a byproduct of their metabolism. These bacteria are obligate anaerobes and cannot tolerate the presence of oxygen.

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