Anaerobic Respiration: Observing Yeast's Oxygen-Free Energy Production

We use yeast to let us observe anaerobic respiration. The yeast is added to warm water and glucose. A layer of oil is placed over the solution so that no oxygen is available. The solution starts to bubble and the gas produced passes along a delivery tube into a test tube containing lime water. The lime water turns cloudy. This shows that the bubbles of gas are carbon dioxide and that respiration has occurred in the absence of oxygen. Biology - Cells And DNA - Learning Points. Anaerobic respiration occurs in cells when oxygen isn't supplied fast enough to meet demand. Anaerobic respiration in humans converts glucose into lactic acid and releases a small amount of useable energy in the process. Anaerobic respiration in yeast produces carbon dioxide and ethanol. Aerobic respiration uses oxygen to convert glucose into carbon dioxide and water and releases energy in the process. Limewater can be used to text for carbon dioxide. A Twig Experiment Film. Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.