In the ONPG and MUG test for fecal coliforms, a sample that is positive for E. coli will be

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Quizplus · Accepted Answer

E. coli is positive for both the ONPG and MUG tests. The ONPG test detects the ability of the bacteria to break down the sugar lactose, and E. coli is able to do this, resulting in a positive reaction. The MUG test detects the presence of the enzyme beta-glucuronidase, which is produced by E. coli, resulting in fluorescence when viewed under UV light. Therefore, a sample that is positive for E. coli will be positive for ONPG and fluorescent in UV light.

In the ONPG and MUG Test for Fecal Coliforms, a Sample