Kingdom Fungi is primarily characterized by organisms that have a multicellular and filamentous body structure. This structure consists of long, slender, thread-like filaments called hyphae, which together form a network known as mycelium. Yeast (e.g., Saccharomyces cerevisiae) is the prominent exception to this rule, as it is a unicellular (single-celled) fungus and does not form true filaments.

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