Yeast is a single‑celled fungus , so it is a unicellular eukaryotic microorganism in the kingdom Fungi.

Quick Scoop

  • Yeast is a fungus, not a bacterium.
  • It is made of just one cell (unicellular) but that cell is eukaryotic, meaning it has a true nucleus and other membrane‑bound organelles.
  • Common yeasts like Saccharomyces cerevisiae are used in bread, beer, and wine because they ferment sugars to produce carbon dioxide and alcohol.

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