MICR 3060 LAB 8 QUESTIONS WITH VERIFIED ANSWERS
what is the purpose of the Methylene Blue Reductase Test? - Answers - to test for the
quality and amount of bacteria in products such as milk
what will cause the methylene blue to lose it color? - Answers - the presence of bacteria
what is the MBRT? - Answers - Methylene Blue Reduction Time
Using the Methylene Blue Test, how would you distinguish between an excellent quality
milk versus a poor-quality milk? - Answers - excellent stays blue and poor loses blue
color
what is the purpose of the standard plate count? - Answers - to determine the number of
bacteria in a solid food sample
For standard plate counts, what units are generally used to report cell numbers? -
Answers - CFUs per mL
what is considered the most accurate countable range of colonies on a plate? - Answers
- 30-300
how is water usually contaminated? - Answers - human/animal feces and improperly
treated sewage water
what is coliform? - Answers - group of gram-negative, nonspore forming, aerobic rods,
which ferment lactose to acid and gas
the presence of what organism in water is an indication of fecal contamination? -
Answers - Escherichia coli
what is presumptive evidence of the presence of coliforms? - Answers - estimates the
number of fecal coliforms in a water based sample
What does "MPN" stand for and how is it estimated? - Answers - Most Probable
Number; is estimated using a table and a formula
what is the purpose of the Methylene Blue Reductase Test? - Answers - to test for the
quality and amount of bacteria in products such as milk
what will cause the methylene blue to lose it color? - Answers - the presence of bacteria
what is the MBRT? - Answers - Methylene Blue Reduction Time
Using the Methylene Blue Test, how would you distinguish between an excellent quality
milk versus a poor-quality milk? - Answers - excellent stays blue and poor loses blue
color
what is the purpose of the standard plate count? - Answers - to determine the number of
bacteria in a solid food sample
For standard plate counts, what units are generally used to report cell numbers? -
Answers - CFUs per mL
what is considered the most accurate countable range of colonies on a plate? - Answers
- 30-300
how is water usually contaminated? - Answers - human/animal feces and improperly
treated sewage water
what is coliform? - Answers - group of gram-negative, nonspore forming, aerobic rods,
which ferment lactose to acid and gas
the presence of what organism in water is an indication of fecal contamination? -
Answers - Escherichia coli
what is presumptive evidence of the presence of coliforms? - Answers - estimates the
number of fecal coliforms in a water based sample
What does "MPN" stand for and how is it estimated? - Answers - Most Probable
Number; is estimated using a table and a formula
