Question

Which bacteria gives a positive reaction towards methyl red test

• A. Enterobacter aerogenes
• B. Escherichia coli
• C. Aspergillus niger
• D. Klebsiella pneumoniae

Hint:

The methyl red test is often used in combination with other tests in the IMViC series for bacterial identification.

Answer 1

The Correct Option is A

The methyl red test detects the ability of bacteria to ferment glucose and produce stable acids. Enterobacter aerogenes gives a negative result, but Escherichia coli and other bacteria can give a positive result, indicating mixed acid fermentation.