Question 1

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

Accepted Answer

A)  leavening.
B)  fermenter.
C)  starter culture.
D)  flavor inducer.
E)  aerator.

Question 2

You want to make wine that will be 20-25% alcohol,but wine rarely gets to that concentration of alcohol.What can you do to accomplish your goal of high-yield alcohol production?

Accepted Answer

A)  Add more sugar to your starting material.
B)  Let your fermentation go longer.
C)  Find an alcohol-tolerant yeast strain.
D)  Add brandy to your wine.

Question 3

The first product produced by genetic manipulation and recombinant technology was:

Accepted Answer

A)  penicillin.
B)  insulin.
C)  cortisone.
D)  amylase.

Question 4

Which is not used as a chemical preservative in food?

Accepted Answer

A)  antibiotics
B)  organic acids
C)  sulfite
D)  ethylene oxide gas
E)  salt

Question 5

What is the best definition of biotransformation?

Accepted Answer

A)  the production of alcohol from a substrate
B)  the production of a toxin from a nontoxic chemical
C)  the oxidation of sugar to carbon dioxide
D)  the use of microorganisms to modify substances that are not normally used for growth

Question 6

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

Accepted Answer

A)  fluorine
B)  activated charcoal
C)  copper sulfate
D)  chlorine

Question 7

You made your first batch (ever) of wine about 6 weeks ago.You used a new plastic garbage can,covered with plastic wrap over the top,for the process.Now you get a cup of it out of the container only to find no alcohol--just really bad juice.What went wrong?

Accepted Answer

A)  The plastic of the container released chemicals that killed the yeasts.
B)  The yeasts were not under anaerobic conditions.
C)  Your yeasts mutated into non-alcohol producing organisms.
D)  You bought the wrong yeast species at the store.

Question 8

Preservation of food to limit microbial survival and growth includes

Accepted Answer

A)  high temperature and pressure.
B)  pasteurization.
C)  refrigeration and freezing.
D)  irradiation.
E)  All of the choices are correct.

Question 9

Which organisms are used to make salt pickles?

Accepted Answer

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

Question 10

In which step of water purification does water move through sand beds and activated charcoal?

Accepted Answer

A)  chlorination
B)  aeration and settling
C)  sedimentation
D)  storage
E)  filtration

Question 11

The basis of the membrane filter technique is:

Accepted Answer

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

Question 12

What type of radiation is best for destroying microbes throughout food?

Accepted Answer

A)  ultraviolet
B)  visible light
C)  gamma rays
D)  infrared
E)  microwaves

Question 13

Indicator bacteria for contaminated water are:

Accepted Answer

A)  coliforms.
B)  Clostridia.
C)  Staphylococci.
D)  all bacteria,since there should be no bacteria at all in treated water.

Question 14

The first stage in making vinegar involves fermentation by

Accepted Answer

A)  Gluconobacter.
B)  Saccharomyces.
C)  Acetobacter.
D)  Propionibacterium.
E)  Spirulina.

Question 15

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

Accepted Answer

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

Question 16

Potable water must be:

Accepted Answer

A)  absolutely clear.
B)  free of pathogens.
C)  totally free of microorganisms.
D)  free of all elements.

Question 17

A quick warming of chicken or eggs is enough to kill Salmonella.

Accepted Answer

A) True 
 B)False

Question 18

Irradiated food becomes radioactive.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)  preparing a mash
B)  malting
C)  aging
D)  wort boiled with hops
E)  fermentation

Question 20

Industrial microbiology is used in the production of

Accepted Answer

A)  antibiotics.
B)  hormones.
C)  vitamins.
D)  vaccines.
E)  All of the choices are correct.

Exam 25: Applied Microbiology and Food and Water Safety

Potable water must be:

Correct AnswerverifiedShow Answer

The basis of the membrane filter technique is:

Correct AnswerverifiedShow Answer

What is the best definition of biotransformation?

Correct AnswerverifiedShow Answer

Which is not used as a chemical preservative in food?

Correct AnswerverifiedShow Answer

The first stage in making vinegar involves fermentation by

Correct AnswerverifiedShow Answer

In which step of water purification does water move through sand beds and activated charcoal?

Correct AnswerverifiedShow Answer

What type of radiation is best for destroying microbes throughout food?

Correct AnswerverifiedShow Answer

Which organisms are used to make salt pickles?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Indicator bacteria for contaminated water are:

Correct AnswerverifiedShow Answer

Industrial microbiology is used in the production of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Preservation of food to limit microbial survival and growth includes

Correct AnswerverifiedShow Answer

A quick warming of chicken or eggs is enough to kill Salmonella.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The first product produced by genetic manipulation and recombinant technology was:

Correct AnswerverifiedShow Answer

You want to make wine that will be 20-25% alcohol,but wine rarely gets to that concentration of alcohol.What can you do to accomplish your goal of high-yield alcohol production?

Correct AnswerverifiedShow Answer

You made your first batch (ever) of wine about 6 weeks ago.You used a new plastic garbage can,covered with plastic wrap over the top,for the process.Now you get a cup of it out of the container only to find no alcohol--just really bad juice.What went wrong?

Correct AnswerverifiedShow Answer

Irradiated food becomes radioactive.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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