Step 1: Understanding the Concept:
Microorganisms are classified into separate kingdoms depending on cell membrane composition, nuclear organization, and modes of feeding.
Step 2: Detailed Explanation:
Saccharomyces (commonly known as Yeast) is a genus of unicellular fungi. Unlike most other fungi that form a network of filaments (mycelium), yeasts exist as single cells that reproduce non-sexually through a process called budding. They are heterotrophic, saprophytic, and play a crucial role in fermenting sugars into alcohol and carbon dioxide.
Step 3: Final Answer:
Saccharomyces is a fungus.