Question

question 11 (1 point)
a positive mr test result is indicated by what color after adding the reagent?
green
blue
yellow
red
question 12 (1 point)
at what ph does methyl red go from yellow to red?
above 4.4
below 8.6
below 4.4
above 8.6

Explanation:

For Question 11: In the MR (Methyl Red) test, a positive result is indicated by a red color after adding the reagent. This is because when bacteria produce sufficient amounts of acid from glucose fermentation, the low pH (acidic conditions) causes the methyl red indicator to turn red.
For Question 12: Methyl red is a pH - sensitive indicator. It goes from yellow to red below a pH of 4.4. At higher pH values (above 4.4), it is yellow.

Answer:

Question 11: red
Question 12: below 4.4