The most abundant prokaryotes helpful to humans in making curd from milk and in the production of antibiotics are the ones categorized as:
A
Chemosynthetic autotrophs
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B
Heterotrophic bacteria
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C
Cyanobacteria
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D
Archaebacteria
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Solution
The correct option is B Heterotrophic bacteria The most abundant prokaryotes helpful to humans in making curd from milk and in the production of antibiotics are the ones categorized as heterotrophic bacteria. For example, tetracycline is a broad spectrum antibiotic produced by Streptomyces genus of Actinobacteria. The Actinobacteria are a phylum of Gram-positive bacteria. Lactobacillus is a genus of gram-positive bacteria and it is used for fermenting foods like yogurt and in dietary supplements.