This document discusses the metabolic processes of yeast, including cellular respiration and fermentation, and how they affect the concentration of glucose, oxygen, carbon dioxide, and ethanol.
Extract
[...] During cellular respiration, cells reject water and CO2. The eukaryotic cells possess organelles. possess a nucleus. The amount of energy produced during the metabolism of a cell: depends on the cell's living environment. depends on the type of organism and therefore on its genetic information. Exercise 2 1. In the presence of yeast the concentration of the air in CO2 increases from 60µmol/L to 120µmol/L in three hours. Without yeast, this concentration is constant. In the presence of yeast the concentration of the air in O2 decreases from 260µmol/L to 0µmol/L in three hours. [...]
[...] Cellular respiration: Glucose (C6H12O6) + 6 O2 ? 6 CO2 + 6 H2O + 36 ATP Fermentation alcoholic: Glucose ? 2 CO2 + 2 Ethanol + 2 ATP Exercise 3 : In this experiment, we see that the yeast grown in media A and C do not develop. In fact, their number remains constant over time (close to zero). On the other hand, the yeast grown in medium B develop very well. In 5 days, we obtain 250 cells in 0.01 mm3. [...]
