Question 1

All of the following are uses for radiation EXCEPT

Accepted Answer

A)  killing of insect eggs and larva. 
B)  inactivation of Trichinella larvae. 
C)  prevention of sprouting. 
D)  heating cold food. 
E)  sterilizing spices. 
A)  killing of insect eggs and larva. 
B)  inactivation of Trichinella larvae. 
C)  prevention of sprouting. 
D)  heating cold food. 
E)  sterilizing spices. D

Question 2

Aseptic packaging works to preserve foods through

Accepted Answer

A)  increasing pH. 
B)  creation of an anaerobic environment. 
C)  mutation of bacterial DNA. 
D)  exposure to high heat. 
E)  creation of an anaerobic environment and high heat. 
A)  increasing pH. 
B)  creation of an anaerobic environment. 
C)  mutation of bacterial DNA. 
D)  exposure to high heat. 
E)  creation of an anaerobic environment and high heat. D

Question 3

As cheese ages, it gets

Accepted Answer

A)  more alcoholic. 
B)  saltier. 
C)  more whey. 
D)  more protein. 
E)  more acidic. 
A)  more alcoholic. 
B)  saltier. 
C)  more whey. 
D)  more protein. 
E)  more acidic. E

Question 4

Write your answer in the space provided or on a separate sheet of paper.
-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 5

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

Accepted Answer

A)  riboflavin. 
B)  aspartame. 
C)  citric acid. 
D)  monosodium glutamate. 
E)  saccharin. 
A)  riboflavin. 
B)  aspartame. 
C)  citric acid. 
D)  monosodium glutamate. 
E)  saccharin.

Question 6

-In Figure 28.1, assume the cells are your desired product and you want to maintain a continuous culture. When would you harvest cells to maximize your yield?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 7

Write 'T' if the statement is true and 'F' if the statement is false.
-If an industrial microbiologist works with Thiobacillus ferrooxidans, he is likely to be involved in
copper mining.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

Radiation works to preserve foods through

Accepted Answer

A)  creation of an anaerobic environment. 
B)  exposure to high heat. 
C)  lethal mutation of bacterial DNA. 
D)  creation of an anaerobic environment and high heat. 
E)  increasing pH. 
A)  creation of an anaerobic environment. 
B)  exposure to high heat. 
C)  lethal mutation of bacterial DNA. 
D)  creation of an anaerobic environment and high heat. 
E)  increasing pH.

Question 10

Write your answer in the space provided or on a separate sheet of paper.
-Vessels used for industrial fermentation reactions are known as bioreactors. Explain the difference between
batch production and continuous flow production using a bioreactor.

Accepted Answer

Batch production in a bioreactor involve

Question 11

You are growing Bacillus subtilis in a bioreactor and notice that the growth rate has slowed and the pH has decreased. What could you add?

Accepted Answer

A)  glucose 
B)  lactic acid 
C)  lactose 
D)  oxygen 
E)  peptides 
A)  glucose 
B)  lactic acid 
C)  lactose 
D)  oxygen 
E)  peptides

Question 12

Write 'T' if the statement is true and 'F' if the statement is false.
-The production of vinegar relies on the microbial oxidation of ethanol to acetic acid.

Accepted Answer

A) True 
 B)False

Question 13

All of the following are true of irradiation methods used for food preservation and sterilization EXCEPT

Accepted Answer

A)  they greatly reduce the number of pathogens present in meats and poultry. 
B)  they prolong shelf-life of fruits and vegetables. 
C)  ionizing radiation such as X rays or gamma rays is used. 
D)  they are used for the sterilization of many spices. 
E)  residual radioactivity is left behind on many foods. 
A)  they greatly reduce the number of pathogens present in meats and poultry. 
B)  they prolong shelf-life of fruits and vegetables. 
C)  ionizing radiation such as X rays or gamma rays is used. 
D)  they are used for the sterilization of many spices. 
E)  residual radioactivity is left behind on many foods.

Question 14

What will be produced if wine is aerated?

Accepted Answer

A)  acetic acid 
B)  $\mathrm { CO } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O }$ 
C)  ethanol $+ \mathrm { CO } _ { 2 }$ 
D)  $\mathrm { CH } _ { 4 }$ 
E)  None of the answers is correct. 
A)  acetic acid 
B)  $\mathrm { CO } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O }$ 
C)  ethanol $+ \mathrm { CO } _ { 2 }$ 
D)  $\mathrm { CH } _ { 4 }$ 
E)  None of the answers is correct.

Question 15

What role do lactic acid bacteria play in cheese production?

Accepted Answer

A)  providing characteristic flavor and smell 
B)  production of holes in Swiss cheese 
C)  curd formation 
D)  ripening the cheese 
E)  Lactic acid bacteria carry out each of these roles in cheese production. 
A)  providing characteristic flavor and smell 
B)  production of holes in Swiss cheese 
C)  curd formation 
D)  ripening the cheese 
E)  Lactic acid bacteria carry out each of these roles in cheese production.

Question 16

Write 'T' if the statement is true and 'F' if the statement is false.
-The longer interior-ripened cheeses are permitted to ripen, the milder the taste of the cheese.

Accepted Answer

A) True 
 B)False

Question 17

Commercial sterilization of processed canned foods uses a 12D treatment which is based upon a theoretical population of $10 ^ { 12 }$ C. botulinum endospores in a can of food. After treatment, there would theoretically be how many endospores left?

Accepted Answer

A)  1 endospore 
B)  100 endospores 
C)  12 endospores 
D)  10 endospores 
E)  0 endospores 
A)  1 endospore 
B)  100 endospores 
C)  12 endospores 
D)  10 endospores 
E)  0 endospores

Question 18

What process does yeast use to produce ethanol for automobile fuel from corn?

Accepted Answer

A)  photosynthesis 
B)  fermentation 
C)  oxidation 
D)  anaerobic respiration 
E)  the Krebs cycle 
A)  photosynthesis 
B)  fermentation 
C)  oxidation 
D)  anaerobic respiration 
E)  the Krebs cycle

Question 19

Canning preserves food

Accepted Answer

A)  by exposure to high heat. 
B)  through use of aseptic packaging. 
C)  by exposure to high pH. 
D)  by exposure to radiation. 
E)  by exposure to chemicals. 
A)  by exposure to high heat. 
B)  through use of aseptic packaging. 
C)  by exposure to high pH. 
D)  by exposure to radiation. 
E)  by exposure to chemicals.

Question 20

Write your answer in the space provided or on a separate sheet of paper.
-Discuss the production of three different non-food/beverage substances that utilize microorganisms in their
production. Your discussion should include the specific microorganisms involved and their role in the
production of each substance.

Accepted Answer

1. Antibiotics: Microorganisms such as P

Exam 24: The Wave Nature of Light

All of the following are uses for radiation EXCEPT

Aseptic packaging works to preserve foods through

As cheese ages, it gets

Write your answer in the space provided or on a separate sheet of paper. -Explain how ionizing radiation can be used to preserve foods. Discuss its advantage over canning as a method of preservation.

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

-In Figure 28.1, assume the cells are your desired product and you want to maintain a continuous culture. When would you harvest cells to maximize your yield?

Write 'T' if the statement is true and 'F' if the statement is false. -If an industrial microbiologist works with Thiobacillus ferrooxidans, he is likely to be involved in copper mining.

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

Radiation works to preserve foods through

Write your answer in the space provided or on a separate sheet of paper. -Vessels used for industrial fermentation reactions are known as bioreactors. Explain the difference between batch production and continuous flow production using a bioreactor.

You are growing Bacillus subtilis in a bioreactor and notice that the growth rate has slowed and the pH has decreased. What could you add?

Write 'T' if the statement is true and 'F' if the statement is false. -The production of vinegar relies on the microbial oxidation of ethanol to acetic acid.

All of the following are true of irradiation methods used for food preservation and sterilization EXCEPT

What will be produced if wine is aerated?

What role do lactic acid bacteria play in cheese production?

Write 'T' if the statement is true and 'F' if the statement is false. -The longer interior-ripened cheeses are permitted to ripen, the milder the taste of the cheese.

Commercial sterilization of processed canned foods uses a 12D treatment which is based upon a theoretical population of 101210 ^ { 12 }1012 C. botulinum endospores in a can of food. After treatment, there would theoretically be how many endospores left?

What process does yeast use to produce ethanol for automobile fuel from corn?

Canning preserves food

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Commercial sterilization of processed canned foods uses a 12D treatment which is based upon a theoretical population of $10 ^ { 12 }$ C. botulinum endospores in a can of food. After treatment, there would theoretically be how many endospores left?