![]() Fermentation releases CO 2, but does not make any ATP – all ATP during anaerobic respiration is produced during glycolysis. ![]() Depending on the organism, pyruvate can either be fermented into ethanol (a fancy name for alcohol) or lactate (lactic acid). Fermentation starts with pyruvate (the end product of glycolysis). The second step in anaerobic respiration is called fermentation. We will discuss this in depth during aerobic respiration. ![]() This is the process of taking one glucose (sugar) molecule and breaking it down into pyruvate and energy (2 ATP). The first step in both anaerobic and aerobic respiration is called glycolysis. Anaerobic respiration has fewer steps, so let’s start there. Although there are some organisms (or cells) that always require anaerobic respiration and others that will always require aerobic respiration. Many organisms (or cells) will use aerobic respiration primarily, however, if there is a limited oxygen supply they can utilize anaerobic respiration for survival. ![]() Aerobic respiration is more efficient and can be utilized in the presence of oxygen, while anaerobic respiration does not require oxygen. There are two types of cellular respiration, aerobic and anaerobic. Cellular respiration is the process by which cells get their energy in the form of ATP. Just like we need energy to get through the day, individual cells need energy for survival too.
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