Question

question 3 (1 point)
what does the methyl red test test for?
all pathogenic bacteria
non - fermenting bacteria
mixed acid fermentation bacteria
a specific test just for e. coli
question 4 (1 point)
a positive vp test indicates the presence of stable acidic end products.
true
false

Explanation:

The methyl red test is used to detect mixed acid fermentation. Bacteria that produce large amounts of acid during glucose fermentation lower the pH of the medium, and methyl red (a pH indicator) turns red. It is not for all pathogenic bacteria, non - fermenting bacteria, or just for E. coli.

For the VP test, a positive VP test indicates the presence of acetoin (a neutral end - product), not stable acidic end - products.

Answer:

Question 3: mixed acid fermentation bacteria
Question 4: False