Discussion
Which soil organisms are the principal natural source of antibiotics such as streptomycin?
Answer: C
Streptomyces, a genus of actinomycetes, produces more than fifty distinct antibiotics, streptomycin among them, which help suppress competing organisms in the soil. Rhizobium fixes nitrogen, Nitrosomonas oxidises ammonium and Thiobacillus oxidises sulphur; none of them is an antibiotic source.
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