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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.
-When you come back the next morning, you notice that the culture in test tube A hasn't grown at all, while all the other ones have. You conclude that the culture must be composed of
A)obligate aerobes.
B)obligate anaerobes.
C)facultative anaerobes.
D)sulphate-reducing bacteria.
E)fermenting organisms.

Question

Quizplus · Accepted Answer

The lack of growth in the test tube suggests that the bacteria in the culture are obligate anaerobes, meaning they cannot survive in the presence of oxygen. All the other cultures have grown, indicating that they are not obligate anaerobes.

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