In the MR-VP test, what end product(s) are detected in the following? a Mixed acid fermentation b Neutral fermentation

Answer 1

Here is the direct answer to the MR-VP test question:

a. Mixed acid fermentation (MR test positive):

End products: Lactic acid, acetic acid, formic acid, succinic acid (lowers pH)

b. Neutral fermentation (VP test positive):

End product: Acetoin (and its precursor 2,3-butanediol)