Question 1

Which chemical is used in both water purification and sewage treatment to provide long-term disinfection?

Accepted Answer

A)  Copper sulfate
B)  Fluorine
C)  Chlorine
D)  Activated charcoalE) A) and B)
F) All of the above

Question 2

A common substrate for industrial fermentation products is ______.

Accepted Answer

A)  nucleotides
B)  cholesterol
C)   molasses
D)   alcoholE) B) and D)
F) B) and C)

Question 3

The difference between water purification and sewage treatment is

Accepted Answer

A)  the amount of air pumped into the water for treatment.
B)  there is microbial degradation in sewage treatment, but not in water purification.
C)  the types of microorganisms used for the treatment.
D)  whether the water source is residential or commercial.E) A) and C)
F) All of the above

Question 4

Which organism is used to initiate the fermentation of cabbage to make sauerkraut?

Accepted Answer

A)  Propionibacterium
B)  Spirulina
C)  Saccharomyces cerevisiae
D)  Streptococcus lactis
E)  Leuconostoc mesenteroidesF) All of the above
G) A) and B)

Question 5

What is the best definition of biotransformation?

Accepted Answer

A)  Oxidation of sugar to carbon dioxide
B)  Use of microorganisms to modify substances not normally used for growth
C)  Production of alcohol from a substrate
D)  Production of a toxin from a nontoxic chemicalE) None of the above
F) A) and C)

Question 6

A good range of temperature to store food is ______.

Accepted Answer

A)  0° to 50°C
B)  20° to 80°C
C)  below 10°C and above 80°C
D)  below 4°C and above 60°C
E)  below -10°C and above 100°CF) None of the above
G) A) and D)

Question 7

The source of wild yeasts carried in a biofilm on grapes is the ______.

Accepted Answer

A)  must
B)  bloom
C)  wort
D)  maltE) A) and B)
F) A) and C)

Question 8

Sewage treatment processes result in the production of ______, which can be used to make electricity.

Accepted Answer

A)  hydrogen gas
B)  carbohydrates
C)  methane
D)  nitratesE) A) and C)
F) A) and B)

Question 9

Primary sewage treatment includes ______.

Accepted Answer

A)  skimming
B)  sludge digesting
C)  chlorination
D)  filtration
E)  aerationF) B) and D)
G) B) and E)

Question 10

Indicator bacteria for contaminated water are ______.

Accepted Answer

A)  coliforms
B)   staphylococci
C)   all bacteria
D)  ClostridiaE) B) and D)
F) C) and D)

Question 11

Which of the following is not a desired outcome from using microbes in making bread?

Accepted Answer

A)  Helping the dough rise
B)  Leavening
C)  Giving flavor and odor
D)  Producing ethyl alcohol
E)  Conditioning the dough to make it workableF) A) and B)
G) C) and D)

Question 12

Yeast fermentation in breads is aerobic.

Accepted Answer

A) True 
 B)False

Question 13

The final treatment of sewage before release into the environment is ______.

Accepted Answer

A)  aeration
B)  filtration
C)  skimming
D)  sludge digesting
E)  chlorinationF) A) and E)
G) C) and D)

Question 14

Irradiated food becomes radioactive.

Accepted Answer

A) True 
 B)False

Question 15

Rennin is added to cheese to help preserve it.

Accepted Answer

A) True 
 B)False

Question 16

You have never seen a jar of jelly contaminated with microbial growth, even though it is used for months at a time.Which is the best explanation?

Accepted Answer

A)  Jelly is pasteurized.
B)  A variety of chemicals are added to jelly to make it inhospitable for bacteria.
C)  Jelly has a high osmotic pressure.
D)  Jelly is filter sterilized.E) B) and D)
F) B) and C)

Question 17

Which of the following would be found within the Hazard Analysis and Critical Control Point guidelines for food safety?

Accepted Answer

A)  Parameters for oyster harvests based on water quality assessment
B)  Temperature requirements for pasteurization of milk
C)  Precise definitions to distinguish fruit juice from fruit nectar
D)  All of these are found in the HACCP management program.E) None of the above
F) C) and D)

Question 18

Which organisms are used to make salt pickles?

Accepted Answer

A)  Propionibacterium and Spirulina
B)  Saccharomyces cerevisiae and Leuconostoc mesenteroides
C)  Streptococcus lactis and Lactobacillus
D)  Pediococcus cerevisiae and Lactobacillus plantarum
E)  Leuconostoc mesenteroides and SpirulinaF) B) and D)
G) B) and E)

Question 19

A 100 ml sample of water is filtered through a sterile membrane, and the membrane is transferred to a plate of m-Endo agar.Following overnight incubation at 37°C, 57 green metallic colonies appear.The coliform count is

Accepted Answer

A)  0.57 per 100 ml.
B)  57 per 100 ml.
C)  5700 per 100 ml.
D)  too numerous to count.E) None of the above
F) All of the above

Question 20

Which of the following is not true of coliforms?

Accepted Answer

A)  They are gram-negative, lactose-fermenting, and gas-producing.
B)  Finding coliforms in water indicates fecal contamination.
C)  Coliform counts are not specific for a particular species of bacteria.
D)   They include
E)  coli, Enterobacter, and Giardia.F) All of the above
G) C) and D)

Exam 25: Applied Microbiology and Food and Water Safety

What is the best definition of biotransformation?

Correct AnswerverifiedShow Answer

Which organism is used to initiate the fermentation of cabbage to make sauerkraut?

Correct AnswerverifiedShow Answer

A common substrate for industrial fermentation products is ______.

Correct AnswerverifiedShow Answer

The difference between water purification and sewage treatment is

Correct AnswerverifiedShow Answer

Primary sewage treatment includes ______.

Correct AnswerverifiedShow Answer

The source of wild yeasts carried in a biofilm on grapes is the ______.

Correct AnswerverifiedShow Answer

Which of the following is not true of coliforms?

Correct AnswerverifiedShow Answer

Sewage treatment processes result in the production of ______, which can be used to make electricity.

Correct AnswerverifiedShow Answer

Which chemical is used in both water purification and sewage treatment to provide long-term disinfection?

Correct AnswerverifiedShow Answer

The final treatment of sewage before release into the environment is ______.

Correct AnswerverifiedShow Answer

A 100 ml sample of water is filtered through a sterile membrane, and the membrane is transferred to a plate of m-Endo agar.Following overnight incubation at 37°C, 57 green metallic colonies appear.The coliform count is

Correct AnswerverifiedShow Answer

Which of the following would be found within the Hazard Analysis and Critical Control Point guidelines for food safety?

Correct AnswerverifiedShow Answer

Indicator bacteria for contaminated water are ______.

Correct AnswerverifiedShow Answer

Which of the following is not a desired outcome from using microbes in making bread?

Correct AnswerverifiedShow Answer

Yeast fermentation in breads is aerobic.

Correct AnswerverifiedShow Answer

A good range of temperature to store food is ______.

Correct AnswerverifiedShow Answer

Irradiated food becomes radioactive.

Correct AnswerverifiedShow Answer

You have never seen a jar of jelly contaminated with microbial growth, even though it is used for months at a time.Which is the best explanation?

Correct AnswerverifiedShow Answer

Rennin is added to cheese to help preserve it.

Correct AnswerverifiedShow Answer

Which organisms are used to make salt pickles?

Correct AnswerverifiedShow Answer

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