Which of the following statements is incorrect? (a) Pathogenic bacteria cause 90% of human diseases (b) A large number of antibiotics are produced by actinomycetes (e.g. Streptomyces) which are a class of fungi. (c) N_(2) -fixing bacteria pick up free N_(2) from soil atmosphere and convert it into nitrogenous compounds. (d) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
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c is incorrect.............................
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