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Yeast

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Description: Notes for students on this large group of non-mycelial, single-celled, Ascomycote fungi.
The yeasts are a large group of non-mycelial, single-celled (acellular) Ascomycote fungi, extremely widely distributed in the biosphere but associated especially with the outside surfaces of fruits, vegetables and leaves. They can all break down glucose into carbon dioxide and ethanol, though most are facultative anaerobes, deriving energy from aerobic respiration ( when oxygen is available and glucose levels reasonably low) but able to switch to the anaerobic process ( when oxygen is in short supply or, in aerobic conditions, when glucose levels are high). Reproduction is by 'budding'
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