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Is yeast autotrophic or heterotrophic?
This bacterium is a kind of heterotrophs.

Yeast can't synthesize organic matter by itself, but can only survive by absorbing ready-made organic matter from the outside.

Autotrophic organisms are organisms that can synthesize organic matter by themselves, such as green algae and cyanobacteria that can carry out photosynthesis, or nitrifying bacteria that can synthesize organic matter through nitration.

Although yeast can't convert inorganic carbon (such as carbon dioxide) into organic carbon (such as glucose), it can convert inorganic nitrogen (such as ammonium ion or nitrate ion) and organic carbon (such as glucose and other sugars) into amino acids, that is, inorganic nitrogen can be converted into organic nitrogen.