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The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as:
- Cyanobacteria
- Archaebacteria
- Chemosynthetic autotrophs
- Heterotrophic bacteria
Correct answer: Heterotrophic bacteria
Solution
Heterotrophic bacteria use ready-made organic compounds, and many of them are the useful microbes involved in fermentation and antibiotic production. Lactobacillus helps convert milk into curd, and several antibiotic-producing species are also heterotrophs.
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