Some types of bacteria can only grow in the presence of certain additives. Further, yeast belongs to the kingdom Fungi while bacteria belong to the kingdom Monera. Most bacteria grow well in moist environments with temperatures ranging between 25-40C. No doubt you think of the type of yeast used in baking breads. Fermenting yeast produces the alcohol in beer and wine. In fact, the smell of fresh baked bread and rising dough can be attributed to alcohol produced from yeast. However, through the selection of strains and development of propagation techniques, more specific applications of yeast are now being found in many different industries, including brewing, malting, farming (animal feeds), pharmaceuticals and dietetics. They reproduce mostly asexually (budding). When the selected antibiotic is added to the agar, only bacterial cells containing the gene insert conferring resistance will be able to grow. This can also be used when creating engineered strains of bacteria that contain an antibiotic-resistance gene. Types: There are 400,000 types of molds. Yeast, a type of fungi (plural for fungus), is found in many places from nature, to research labs and even everyday kitchens for baking. Soy sauce is produced by fermenting Aspergillus ortzae, a fungus, growing on soy beans. Fermentation is used to make many ethnic foods such as sauerkraut and miso. There are 1500 types of yeasts. However, some like it colder (just over freezing) and some like it hot (60-80C). The stringent conditions of beer fermentation have selected for unique groups of yeast and bacteria specialized for growth in beer—and usually not much else. Some species, such as Candida, can grow as white patches with a glossy surface. Gram-positive bacteria. 7: Sporing: Mold is a sporing fungi : Yeast is a not a sporing species of fungi. 8: Reproduction: Sexually and asexually reproduce into multi-cellular form. All species described in this section are the most prevalent contaminants of beer from the start of fermentation through to the packaged product. Bacterial growth, like yeast, is affected by moisture, ph, temperature, food supply, salt, sugar, oxygen supply and light. Bacteria thrive at a pH around neutrality (6.5- 8.0). Fermentation occurs in certain types of bacteria and fungi that require an oxygen-free environment to live (known as obligate anaerobes), in facultative anaerobes such as yeast, and also in muscle cells when oxygen is in short supply (as in strenuous exercise). The main difference between yeast and bacteria is that yeast is a eukaryote whereas bacteria are prokaryotes. Yeast and fungi can cause infections in your body and on your skin. Many people associate yeast infections with the vagina, and that is one type of yeast infection. 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