Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 31

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
a. If fermentation of sugars to produce alcohol in wine is anaerobic, why do winemakers make sure that the early phase of yeast growth is aerobic
b. In many cases, the identification of bacteria in a tank of beer signals trouble for the brewing process. Explain biochemically why this is so.