Question 1

Aseptic packaging utilizes which of the following to sterilize laminated paper or plastic prior to filling with food?

Accepted Answer

A)  hot HCl solution
B)  gamma radiation
C)  hot hydrogen peroxide solution
D)  X rays
E)  autoclaveF) C) and E)
G) B) and C)

Question 2

Explain how ionizing radiation can be used to preserve foods.Discuss its advantage over canning as a method of preservation.

Accepted Answer

Ionizing radiation can be used to preser...

Question 3

All of the following are industrial products produced using microbial fermentations EXCEPT

Accepted Answer

A)  aspartic acid.
B)  citric acid.
C)  glutamic acid.
D)  riboflavin.
E)  saccharin.F) C) and D)
G) B) and E)

Question 4

High-pressure processing of foods such as deli meats and precooked chicken strips targets pathogens such as Salmonella and Listeria.

Accepted Answer

A) True 
 B)False

Question 5

Figure 28.2
 
-Which of the growth curves in Figure 28.2 is indicating the culture has reached the trophophase?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) B) and D)
G) All of the above

Question 6

All of the following are advantages of a bioreactor instead of a flask culture EXCEPT

Accepted Answer

A)  larger culture volumes can be grown.
B)  instrumentation for monitoring environmental conditions.
C)  uniform aeration and mixing.
D)  aseptic sampling.
E)  None of the answers is correct;all of these are advantages of using a bioreactor instead of a flask culture.F) A) and D)
G) A) and C)

Question 7

Microbial products can be improved by all of the following EXCEPT

Accepted Answer

A)  isolating new strains.
B)  mutating existing strains.
C)  genetically modifying strains.
D)  modifying culture conditions.
E)  sterilization.F) B) and E)
G) B) and C)

Question 8

The longer interior-ripened cheeses are permitted to ripen,the milder the taste of the cheese.

Accepted Answer

A) True 
 B)False

Question 9

All of the following foods are produced using microbial fermentations EXCEPT

Accepted Answer

A)  sauerkraut.
B)  ketchup.
C)  sour cream.
D)  yogurt.
E)  coffee.F) B) and C)
G) C) and D)

Question 10

If an industrial microbiologist works with Acidithiobacillus ferrooxidans,he is likely to be involved in copper mining.

Accepted Answer

A) True 
 B)False

Question 11

Microorganisms themselves are commercial products.Which of the following microbes is available as (or in) a product sold in retail stores?

Accepted Answer

A)  Bacillus thuringiensis
B)  Lactobacillus
C)  Rhizobium
D)  Saccharomyces
E)  All of these organisms can be found in various commercial products.F) B) and E)
G) A) and B)

Question 12

Figure 28.1
 
-In Figure 28.1,assume the cells are your desired product and you want to maintain a continuous culture.Remember,the top lines/markings indicate the different phases observed in the curve below them.When would you harvest cells to maximize your yield?

Accepted Answer

A)  a
B)  b
C)  c
D)  dE) C) and D)
F) None of the above

Question 13

Use of fossil fuels is beginning to change in modern society.Describe what a biofuel is,and identify/discuss the pros and cons of biofuels.

Accepted Answer

Biofuels are a type of fuel that is deri...

Question 14

Spoilage of canned foods due to inadequate processing,NOT accompanied by gas production,is

Accepted Answer

A)  thermophilic anaerobic spoilage.
B)  flat sour spoilage.
C)  spoilage by mesophilic bacteria.
D)  caused by acid-tolerant fungi.
E)  putrefactive anaerobic spoilage.F) B) and D)
G) C) and D)

Question 15

The blue-green clumps observed in Roquefort cheese are a result of mold growth.

Accepted Answer

A) True 
 B)False

Question 16

Commercial sterilization of processed canned foods uses a 12D treatment which is based upon a theoretical population of 10¹² C.botulinum endospores in a can of food.After treatment,there would theoretically be how many endospores left?

Accepted Answer

A)  120 endospores
B)  10 endospores
C)  100 endospores
D)  12 endospores
E)  1 endosporeF) C) and E)
G) A) and D)

Question 17

What will be produced if wine is aerated and inoculated with bacteria of the genera Acetobacter and Gluconobacter?

Accepted Answer

A)  ethanol + CO₂
B)  CO₂ + H₂O
C)  CH₄
D)  acetic acid
E)  None of the answers is correct.F) A) and B)
G) B) and D)

Question 18

Figure 28.2
 
-Which of the growth curves in Figure 28.2 is indicating the culture has reached the idiophase?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) B) and E)
G) A) and E)

Question 19

Which one of the following reactions makes wine less acidic,and is important for good flavor when grapes with higher acidity are used?

Accepted Answer

A)  sugar → ethanol
B)  ethanol → acetic acid
C)  malic acid → lactic acid
D)  carbon dioxide → sucrose
E)  sugar → CO₂ + H₂OF) None of the above
G) B) and C)

Question 20

The following steps are required for making cheese.What is the second step,which helps to provide the characteristic flavors and aromas of the cheese?

Accepted Answer

A)  enzymatic coagulation of milk
B)  fermentation of curd
C)  inoculation with lactic acid bacteria
D)  inoculation with Penicillium
E)  separation of curds and wheyF) A) and C)
G) D) and E)

Exam 28: Applied and Industrial Microbiology

The following steps are required for making cheese.What is the second step,which helps to provide the characteristic flavors and aromas of the cheese?

Correct AnswerverifiedShow Answer

Aseptic packaging utilizes which of the following to sterilize laminated paper or plastic prior to filling with food?

Correct AnswerverifiedShow Answer

High-pressure processing of foods such as deli meats and precooked chicken strips targets pathogens such as Salmonella and Listeria.

Correct AnswerverifiedShow Answer

Explain how ionizing radiation can be used to preserve foods.Discuss its advantage over canning as a method of preservation.

Correct AnswerAnswered by ExamLex AIIonizing radiation can be used to preser...View AnswerShow Answer

Figure 28.2 -Which of the growth curves in Figure 28.2 is indicating the culture has reached the trophophase?

Correct AnswerverifiedShow Answer

All of the following are advantages of a bioreactor instead of a flask culture EXCEPT

Correct AnswerverifiedShow Answer

Commercial sterilization of processed canned foods uses a 12D treatment which is based upon a theoretical population of 10¹² C.botulinum endospores in a can of food.After treatment,there would theoretically be how many endospores left?

Correct AnswerverifiedShow Answer

Figure 28.2 -Which of the growth curves in Figure 28.2 is indicating the culture has reached the idiophase?

Correct AnswerverifiedShow Answer

Microbial products can be improved by all of the following EXCEPT

Correct AnswerverifiedShow Answer

The longer interior-ripened cheeses are permitted to ripen,the milder the taste of the cheese.

Correct AnswerverifiedShow Answer

Use of fossil fuels is beginning to change in modern society.Describe what a biofuel is,and identify/discuss the pros and cons of biofuels.

Correct AnswerAnswered by ExamLex AIBiofuels are a type of fuel that is deri...View AnswerShow Answer

If an industrial microbiologist works with Acidithiobacillus ferrooxidans,he is likely to be involved in copper mining.

Correct AnswerverifiedShow Answer

Figure 28.1 -In Figure 28.1,assume the cells are your desired product and you want to maintain a continuous culture.Remember,the top lines/markings indicate the different phases observed in the curve below them.When would you harvest cells to maximize your yield?

Correct AnswerverifiedShow Answer

Microorganisms themselves are commercial products.Which of the following microbes is available as (or in) a product sold in retail stores?

Correct AnswerverifiedShow Answer

Which one of the following reactions makes wine less acidic,and is important for good flavor when grapes with higher acidity are used?

Correct AnswerverifiedShow Answer

The blue-green clumps observed in Roquefort cheese are a result of mold growth.

Correct AnswerverifiedShow Answer

What will be produced if wine is aerated and inoculated with bacteria of the genera Acetobacter and Gluconobacter?

Correct AnswerverifiedShow Answer

All of the following are industrial products produced using microbial fermentations EXCEPT

Correct AnswerverifiedShow Answer

All of the following foods are produced using microbial fermentations EXCEPT

Correct AnswerverifiedShow Answer

Spoilage of canned foods due to inadequate processing,NOT accompanied by gas production,is

Correct AnswerverifiedShow Answer

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