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Color of granule of actinomycetes:

  • A.Black
  • B.Yellow
  • C.Red
  • D.Brown

Answer: A

Correct answer: Yellow

The granules of Actinomyces israelii are the sulphur granules, and they are named for their colour: yellow, sometimes deepening to yellowish-brown. Among the other actinomycetes, Nocardia and Actinomadura madurae give white to yellowish granules and Actinomadura pelletieri red ones. Black granules are produced only by the true fungi, chiefly Madurella mycetomatis, so a black granule points away from an actinomycete altogether and towards a eumycetoma.

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