Sierra College Department of Biological Sciences

Microbiology Diagnostic Tests: Methyl Red (MR) Test

This test is used to determine if or not bacteria can ferment glucose and form end products that will overcome the buffers present in the medium. This is a quantitative test.


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1. Which of these tubes contains organisms that are Methyl Red positive?

2. The Methyl Red test is a quantitative test used to determine the amount of what end product of glucose fermentation?

3. What is the name of the pH indicator used for this test?

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