You inoculate a culture into a test tube containing broth and take it out of the incubator the next day.You see the culture is growing at the bottom of the tube.You conclude the culture must be:

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Quizplus · Accepted Answer

Anaerobic bacteria grow at the bottom of the tube because they do not require oxygen to grow. Aerobic bacteria grow at the top of the tube because they require oxygen. Facultative anaerobes can grow with or without oxygen and tend to grow throughout the entire tube. Microaerophilic bacteria require small amounts of oxygen to grow and will grow at a specific level within the tube. Aerotolerant bacteria do not require oxygen but are not affected by its presence and will grow evenly throughout the tube. Since the culture is growing at the bottom of the tube, it must be anaerobic.

You Inoculate a Culture into a Test Tube Containing Broth