Multiple choice

A-factor (microbial hormone) is required for the synthesis of

  1. streptomycin

  2. clindamycin

  3. bacitracin

  4. chloremphenicol

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A Correct answer
Explanation

A-factor induces streptomycin production by Streptomyces griseus. It triggers cellular differentiation in Actinomyces. A-factor exerts its regulatory role by binding to a specific receptor protein which, in the absence of A-factor, acts as a repressor-type regulator for morphological and physiological differentiation.