A Bacterium Was Grown in Two Test Tubes Filled with Media

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 color. If the bacterium is able to produce ATP only by aerobic respiration, we expect lightening of media in ________.

A) the sealed tube only
B) the unsealed tube only
C) the sealed and unsealed tubes only
D) the control tube only
E) all three tubes