Basic Information It is known that all living cells must perform respiration to survive. There are two such forms of breathing. The first and most common form of breathing is the so-called aerobic respiration, which is performed in the presence of oxygen. The other form of respiration is called anaerobic respiration. This particular breathing method is much less efficient than aerobic breathing and is only performed when the O2 supply is depleted (or never existed to begin with). Aerobic respiration also uses the resulting product of glycolysis (which is pyruvate) in the Krebs cycle. known as the citric acid cycle, to create much more energy in the form of ATP (adenosine triphosphate). The equation for aerobic respiration is as follows: glucose + oxygen -> carbon dioxide + water + energy C6H12O6 + 6O2 -> 6CO2 + 6H2O + energy ATP is the high-energy molecule that stores the energy needed to perform actions . It is present in the cytoplasm and nucleoplasm of every living cell, and essentially any physiological organism that requires energy to function derives this energy directly from stored ATP molecules. Aerobic respiration has three phases: glycolysis, the Krebs cycle and oxidative phosphorylation. During glycolysis, glucose is broken down and converted into pyruvate, the end product of glycolysis. Subsequently, the Krebs cycle subjects pyruvate to conversions that lead to the production of coenzymes, a molecule of ATP and CO2. Finally, the coenzymes undergo the process of oxidative phosphorylation, passing them through an electron transport chain until the production of ATP. After a......half the paper......will form and at a faster rate. Likewise, increasing enzyme concentration allows more enzymes to collide with substrate molecules. Both methods have limiting factors, meaning that once a certain concentration is reached, respectively, the enzyme or substrate molecules will become saturated and will no longer work effectively. The final way to change the rate of enzyme action is to increase the pH level. pH is the measurement of the acidity and basicity of a solution. This scale ranges from pH1 to pH14; a higher concentration of hydrogen ions (H+) to a lower concentration of hydroxide ions (OH-).- Sugars/carbohydrates used by the yeast or Formulas/diagrams of each- Enzymes in yeast that act on the sugars and carbohydrates above- Factors that influence the enzymatic action o Temp o Enzyme concentration o pH- Evidence of anaerobic respiration – positive tests for CO2.