This lesson plan explains anaerobic respiration and its role in human society. It is designed for two class periods, each 50 minutes in length, and one take home activity. Students are going to compare and contrast the physiology of two types of anaerobic respiration and identify different microorganisms that are used in the modern food industry. The teacher explains and presents the content and the procedures on the first day as a lesson walk through. There is an optional activity (yogurt making and bacterial smear) that can easily be performed in the classroom. It is highly recommended that Honors and AP students should be given the optional activity provided with this lesson plan.