Brewer's (aka baker's yeast or commercial yeast), is the organism that is used to make bread rise and produce wine from the fruits of grape. It also is extremely important as a 'model organism' in bio...Brewer's (aka baker's yeast or commercial yeast), is the organism that is used to make bread rise and produce wine from the fruits of grape. It also is extremely important as a 'model organism' in biology. It was the first eukaryote to have its entire genome sequenced and studies using S. cervisiae have been highly significant in developing our understanding of meiosis, mitosis and cancer.