Yeast is a single-celled fungus, it's a microorganism with a nucleus, cytoplasm, vacuole, cell membrane and a cell wall.
Yeast can respire with or without oxygen:
Anaerobically (called fermentation) - glucose ------> ethanol + carbon dioxide + energy
Aerobically (needed to grow and reproduce) - glucose + oxygen ------> carbon dioxide + water + energy
- Yeast is used in dough to produce nice, light bread
- The yeast converts sugars to carbon dioxide…