The use of micro-organisms, which are often genetically engineered, for industrial and pharmaceutical purposes. Biotrophic
A biotrophic parasite is one that obtains nutrients from the living tissues of its host, as opposed to a necrotrophic parasite, which kills those tissues with toxins before consuming them. Biotype
A subdivision of a species in which all individuals are morphologically identical but physiologically (or parasitologically) dissimilar. Entomologists tend to refer to vertical pathotypes of insects as 'biotypes', but the term is imprecise.
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