Microbes play an important role in baking process.
Saccharomyces cereviciae is the yeast used in bread making. The dough for bread making is made usually of wheat. The dough contains carbohydrates on which the yeast acts upon.
The yeast converts the carbohydrates into simple sugars and this process releases alcohol and carbon dioxide. This carbon dioxide causes the bread to puff up making it fluffy.
Yeast also is a crucial microbe in cheese making. Propionibacterium shermanii is the yeast used in the manufacture of swiss cheese. Large holes are a characteristic feature of swiss cheese while is produced by the action of this yeast.