Home Biology Microbes in Human Welfare Previous Year Questions Identify the microorganism which is responsi…
Biology Microbes in Human Welfare Previous Year Questions Single Correct MCQ
Published on: August 21, 2026

Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A:

A
Streptococcus cerevisiae
B
Trichoderma polysporum
C
Clostridium butylicum
D
Aspergillus niger

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Cyclosporin is a bioactive substance. It is used as an immunosuppressive agent in organ-transplant patients and is produced by the fungus Trichoderma polysporum. Aspergillus niger (a fungus) is involved in the production of citric acid. Streptococcus cerevisiae is used for commercial production of ethanol. Clostridium butylicum (a bacterium) is involved in the production of butyric acid.

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