Question

Please answer all

31) What substance in this phenol red dextrose fermentation tube was catabolized to produce the ( demonstrated colorimetric change? Image gallery (click for full size) B2) What is (most likely) the gas that is trapped in the Durham tube? (1 pts) Image gallery (click for full size)

Answer 1

QUESTION 31

In this case, remember that the end product will depends on the organism and the substrate. In this example, dextrose is used and when it is used during the process of fermentation, it may produce an acid substances called lactic acid. This acid change the pH of the test tube, changing its color from red to yellow. So the correct answer is lactic acid

QUESTION 32

Another product of fermentation is carbon dioxide in form of gas which is trapped in the Durham tube