JP Lab6A-7: Methyl Red Test

The methyl red test is often run in tandem with the : A) Vogues-Proskuer test B) OF Test C) Phenol Red Test D) Citrate Test

A

What are the results of the organism below on the MR test? A) Mixed acid fermentation negative B) Mixed acid fermentation positive

A

What are the results of the organism below on the MR test? A) Mixed acid fermentation positive B) Mixed acid fermentation negative

A

What would a bacteria that could perform mixed acid fermentation produce on this test? A) Red B) Pink C) Yellow

A

How is this metabolic test innoculated? A) pasteur pipette B) loop to broth transfer C) spread plating D) stab with a needle

B

When is the indicator added in this test? A) at the same time as the bacteria are added B) following 24 hours of inoculation C) prior to inoculation D) when the media is created

B

Match the indicator's color change to the environmental condition in this test.

Yellow: Neutral Red: Acidic

Match the following outcome of the test to the final color of the media.

Yellow: mixed acid fermentation negative Red: mixed acid fermentation positive

Why do mildly fermenting organism not produce a positive result? A) There is no indicator used in the media B) The media is buffered against mild pH changes C) They do not produce acid

B

What is the indicator used in this metabolic test? A) neutral red B) bromthymol blue C) methyl red D) phenol red

C