Eduprobe
Question:
Which of the following statements is correct?
Aspergillus niger is used for producing cyclosporin A.
Activated sludge is digested by anaerobic bacteria to produce carbon gas.
Fleming, Chain, and Florey were awarded the nobel prize for discovering penicillin.
BOD is amount of oxygen produced by bacteria on decomposition.
Solution:
A. Citric acid is produced mainly by submerged fermentation using Aspergillus niger or Candida sp. Cyclosporine A is an antibiotic widely produced by submerged fermentation of aerobic fungi identified as Trichoderma polysporum.
B. Activated sludge is digested by anaerobic bacteria to produce marsh gas during treatment of wastewater.
C. The Nobel Prize in Physiology or Medicine 1945 was awarded jointly to Sir Alexander Fleming, Ernst Boris Chain and Sir Howard Walter Florey for the discovery of penicillin and its curative effect in various infectious diseases.
D. Biochemical oxygen demand (BOD), the amount of dissolved oxygen used by microorganisms in the biological process of metabolizing organic matter in water.
So, the correct answer is 'Fleming, Chain, and Florey were awarded the Nobel prize for discovering penicillin'.