Question 1

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

Accepted Answer

A)   Fluorine
B)   Copper sulfate
C)   Activated charcoal
D)   ChlorineE) All of the above
F) B) and C)

Question 2

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

Accepted Answer

A)   chlorination
B)   aeration
C)   ﬁltration
D)   skimming
E)   sludge digestingF) C) and D)
G) None of the above

Question 3

A pure or mixed sample of known microbes added to food is a/an ______.

Accepted Answer

A)   aerator
B)   leavening
C)   fermenter
D)   starter culture
E)   ﬂavor inducerF) A) and D)
G) B) and C)

Question 4

Biotechnology includes all of the following except _______.

Accepted Answer

A)   modifying antibiotics with different chemical functional groups to increase their potency
B)   using genetically-modiﬁed
C)   using bacterial antifreeze proteins to protect crops from lethal frosts
D)   using bacterial insecticidal proteins as a means to combat mosquitoes as disease vectors
E)   coli as a tool to detect cancerF) A) and E)
G) A) and D)

Question 5

Which step in making beer involves soaking malt grain, grinding it, and heating with sugar and starch?

Accepted Answer

A)   Malting
B)   Aging
C)   Wort boiled with hops
D)   Preparing a mash
E)   FermentationF) A) and C)
G) B) and C)

Question 6

The basis of the membrane ﬁlter technique is that _______.

Accepted Answer

A)   bacteria are larger than the holes in the ﬁlter
B)   the membrane has an antibiotic that kills bacteria in the water
C)   bacteria are small enough to go right through the ﬁlter
D)   the dilutions of the sample allow a total bacterial count when plated out using pour or spread platesE) A) and B)
F) A) and D)

Question 7

Irradiated food becomes radioactive.

Accepted Answer

A) True 
 B)False

Question 8

Identify the chemical formula missing from the following equation. Yeast + _______ → 2C2H5OH + 2CO₂

Accepted Answer

A)   O₂
B)   C₆H₁₂O₆
C)   C5H₁₂O5
D)   H₂O
E)   CH₃CHOF) A) and E)
G) A) and D)

Question 9

Sewage sludge, the solid that remains after aerobic decomposition, makes a useful fertilizer because _______.

Accepted Answer

A)   it contains signiﬁcant energy in the form of methane
B)   it is rich in carbon and nitrogen
C)   it has been treated to remove microbes and will not be a source of pathogens
D)   it is rich in nitrogen, phosphorus, and potassiumE) C) and D)
F) A) and B)

Question 10

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

Accepted Answer

A)   bloom
B)   malt
C)   must
D)   wortE) A) and C)
F) All of the above

Question 11

Potable water must be ______.

Accepted Answer

A)   absolutely clear
B)   sterile
C)   free of all elements
D)   free of pathogensE) A) and C)
F) None of the above

Question 12

An organism used to make a variety of industrial enzymes by fermentation is ______.

Accepted Answer

A)   E. coli
B)   Aspergillus
C)   Penicillium
D)   SalmonellaE) A) and B)
F) None of the above

Question 13

A device in which mass cultures are grown, reactions take place, and product develops is a/an ______.

Accepted Answer

A)   activator
B)   incubator
C)   sparger
D)   fermentorE) C) and D)
F) None of the above

Question 14

Media used for coliform enumeration include chemicals that change color depending on the enzymes present in the microbes, thereby allowing a count of total bacteria and total coliforms from a single plate. This type of medium is termed ______.

Accepted Answer

A)   selective
B)   de?ned
C)   complex
D)   differentialE) B) and D)
F) B) and C)

Question 15

Dehydration is an excellent microbicidal method.

Accepted Answer

A) True 
 B)False

Question 16

In industrial microbiology, microbes growing on inexpensive nutrients are induced to synthesize valuable products such as amino acids, nucleotides, organic acids and vitamins.

Accepted Answer

A) True 
 B)False

Question 17

Which bacteria ferment lactose in milk, producing acids that curdle the milk?

Accepted Answer

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

Question 18

The mass, controlled culture of microbes to produce desired organic compounds is ______.

Accepted Answer

A)   biosynthesis
B)   bioremediation
C)   biotechnology
D)   fermentationE) All of the above
F) A) and D)

Question 19

The products of maltose fermentation in bread-making are ______.

Accepted Answer

A)   ethanol and water
B)   ethanol and carbon dioxide
C)   lactic acid and carbon dioxide
D)   lactic acid and water
E)   carbon dioxide and waterF) D) and E)
G) A) and D)

Question 20

Preventing the incorporation of microbes into food can by achieved by _______.

Accepted Answer

A)   washing fruits and vegetables
B)   aseptic techniques for handling meat, eggs, and milk
C)   handwashing and proper hygiene in the kitchen
D)   avoiding cross-contamination of utensils and cutting boards
E)   All of the choices are correct.F) A) and D)
G) A) and E)

Exam 25: Applied Microbiology and Food and Water Safety

Which bacteria ferment lactose in milk, producing acids that curdle the milk?

Correct AnswerverifiedShow Answer

An organism used to make a variety of industrial enzymes by fermentation is ______.

Correct AnswerverifiedShow Answer

The products of maltose fermentation in bread-making are ______.

Correct AnswerverifiedShow Answer

A device in which mass cultures are grown, reactions take place, and product develops is a/an ______.

Correct AnswerverifiedShow Answer

Dehydration is an excellent microbicidal method.

Correct AnswerverifiedShow Answer

Sewage sludge, the solid that remains after aerobic decomposition, makes a useful fertilizer because _______.

Correct AnswerverifiedShow Answer

Which step in making beer involves soaking malt grain, grinding it, and heating with sugar and starch?

Correct AnswerverifiedShow Answer

Biotechnology includes all of the following except _______.

Correct AnswerverifiedShow Answer

The basis of the membrane ﬁlter technique is that _______.

Correct AnswerverifiedShow Answer

Preventing the incorporation of microbes into food can by achieved by _______.

Correct AnswerverifiedShow Answer

Media used for coliform enumeration include chemicals that change color depending on the enzymes present in the microbes, thereby allowing a count of total bacteria and total coliforms from a single plate. This type of medium is termed ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Potable water must be ______.

Correct AnswerverifiedShow Answer

The mass, controlled culture of microbes to produce desired organic compounds is ______.

Correct AnswerverifiedShow Answer

A pure or mixed sample of known microbes added to food is a/an ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the chemical formula missing from the following equation. Yeast + _______ → 2C2H5OH + 2CO₂

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In industrial microbiology, microbes growing on inexpensive nutrients are induced to synthesize valuable products such as amino acids, nucleotides, organic acids and vitamins.

Correct AnswerverifiedShow Answer

Irradiated food becomes radioactive.

Correct AnswerverifiedShow Answer

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