A Bacterium Was Grown in Two Test Tubes Filled with Media

question 32

Multiple Choice

A bacterium was grown in two test tubes filled with media rich in glucose. One tube was sealed to produce anaerobic conditions, and the other was not. A third uninoculated, unsealed tube was used as a control. Glucose utilization by this bacterium causes acid production, which is indicated by a lightening of the media colour. If the bacterium is able to produce ATP only by respiration, which result do you expect to receive?

• A) lightening of media in the unsealed tube only
• B) lightening of media in all three tubes
• C) lightening of media in the sealed tube only
• D) lightening of media in the control tube only
• E) lightening of media in the sealed and unsealed tubes only

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