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 respiration,which result do you expect to receive?
A)lightening of media in the sealed tube only
B)lightening of media in the unsealed tube only
C)lightening of media in the sealed and unsealed tubes only
D)lightening of media in the control tube only
E)lightening of media in all three tubes

Question

Quizplus · Accepted Answer

If the bacterium can only produce ATP by respiration, then it requires oxygen to grow, and it will not grow under anaerobic conditions. Therefore, it will not light up the media in the anaerobic, sealed tube. The control tube was not inoculated and therefore does not have any bacteria to produce ATP. The unsealed tube allows for aerobic respiration, which means that the bacterium can utilize glucose and produce ATP, causing acid production and lightening of the media color. Therefore, the unsealed tube will show a lightening of the media color. The sealed, anaerobic tube will not.

A Bacterium Was Grown in Two Test Tubes Filled with Media