Question 1

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called

Accepted Answer

A)  thermophiles.
B)  halophiles.
C)  psychrophiles.
D)  extremophiles.
E)  barophiles.F) A) and B)
G) A) and C)

Question 2

The term facultative refers to

Accepted Answer

A)  the ability to exist in a wide range of conditions.
B)  existing in a very narrow niche.
C)  using chemicals for energy production.
D)  using light for energy production.
E)  using oxygen for metabolism.F) A) and D)
G) C) and D)

Question 3

When it is important to count the number of cells,determine cell size,and differentiate between dead and live cells,a/n ___ is used.

Accepted Answer

A)  coulter counter
B)  flow cytometer
C)  SEM
D)  methylene dye indicator
E)  turbidity counterF) B) and D)
G) A) and B)

Question 4

In the viable plate count method,a measured sample of a culture is evenly spread across an agar surface and incubated.Each _____ represents one _____ from the sample.

Accepted Answer

A)  cell;cell
B)  cell;colony
C)  colony;cell
D)  species;colony
E)  generation;cellF) All of the above
G) A) and D)

Question 5

An organism that cannot tolerate an oxygen environment is a/n

Accepted Answer

A)  aerobe.
B)  obligate aerobe.
C)  facultative anaerobe.
D)  microaerophile.
E)  obligate anaerobe.F) C) and D)
G) B) and C)

Question 6

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 7

Planktonic bacteria are more susceptible to antibiotics as compared to biofilm microorganisms.

Accepted Answer

A) True 
 B)False

Question 8

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Accepted Answer

A) True 
 B)False

Question 9

Anaerobes can be cultured in a CO2 environment.

Accepted Answer

A) True 
 B)False

Question 10

You have inoculated your Clostridium species into a tube of media.After incubation,you find that it is not growing and you then realize that this organism is an obligate anaerobe.What is the best explanation for this lack of growth?

Accepted Answer

A)  Clostridium does not have enzymes to break down hydrogen peroxide.
B)  There is not enough oxygen for use when hydrogen peroxide is present.
C)  There is not enough water in the environment for Clostridium to grow.
D)  Oxygen in the medium destroys the enzymes needed by Clostridium to undergo aerobic respiration.E) A) and C)
F) A) and B)

Question 11

Mediated transport of polar molecules and ions across the plasma membrane utilizes a/n _____ carrier that will bind to the substance,effecting a conformational change that allows movement across the membrane.

Accepted Answer

A)  protein
B)  lipid
C)  porin
D)  enzymeE) B) and D)
F) None of the above

Question 12

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Accepted Answer

A)  catalase and hydrogen peroxidases.
B)  superoxide dismutase and hydrogen peroxidase.
C)  superoxide dismutase and catalase.
D)  catalase and oxidase.
E)  superoxide dismutase and oxidase.F) A) and B)
G) C) and D)

Question 13

The methanogens,producers of methane gas,require environments that

Accepted Answer

A)  have sunlight.
B)  are very acidic.
C)  have abundant oxygen and CO2.
D)  are extremely cold.
E)  are anaerobic with hydrogen gas and CO2.F) A) and B)
G) A) and E)

Question 14

The degree of turbidity in a broth culture correlates to the amount of cell growth.

Accepted Answer

A) True 
 B)False

Question 15

You inoculate the bacterium into 3 tubes of nutrient broth medium containing salt--0.5% NaCl,5% NaCl,and 15% NaCl.After incubation,you notice that the organism is growing very well in the 15%,and somewhat in the 5%.There is no growth in the third tube.This organism would be called:

Accepted Answer

A)  haloduric
B)  osmophobic
C)  halophilic
D)  barophilicE) A) and B)
F) A) and C)

Question 16

The production of antibiotics is a form of antagonism called

Accepted Answer

A)  symbiosis.
B)  satellitism.
C)  antibiosis.
D)  mutualism.
E)  synergism.F) C) and E)
G) A) and E)

Question 17

A change in one partner,in a close relationship,that leads to a change in the other partner is

Accepted Answer

A)  symbiosis.
B)  coevolution.
C)  antibiosis.
D)  mutualism.
E)  synergism.F) A) and C)
G) All of the above

Question 18

An important mineral ion of the cytochrome pigments of cellular respiration is

Accepted Answer

A)  iron.
B)  zinc.
C)  calcium.
D)  magnesium.
E)  potassium.F) B) and E)
G) D) and E)

Question 19

The milk that you bought from a grocery store a month ago got pushed to the back of the refrigerator hidden by other objects.Finding it a month later,unopened,you would like to now use it.Which statement is true?

Accepted Answer

A)  The milk will still be fresh since it is a sterilized product.
B)  Only thermoduric bacteria will be thriving in the milk.
C)  The milk will still be fresh since the lactose sugar prevents the growth of any microorganisms.
D)  The milk will be spoiled,making you realize you should be purchased raw milk for it would still be fresh since it contains no microorganisms.E) A) and B)
F) A) and C)

Question 20

Bacterial biofilms stimulate the immune system differently than planktonic bacteria.

Accepted Answer

A) True 
 B)False

Exam 7: Microbial Nutrition, Ecology, and Growth

Anaerobes can be cultured in a CO2 environment.

Correct AnswerverifiedShow Answer

Bacterial biofilms stimulate the immune system differently than planktonic bacteria.

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In the viable plate count method,a measured sample of a culture is evenly spread across an agar surface and incubated.Each _____ represents one _____ from the sample.

Correct AnswerverifiedShow Answer

An organism that cannot tolerate an oxygen environment is a/n

Correct AnswerverifiedShow Answer

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Correct AnswerverifiedShow Answer

An important mineral ion of the cytochrome pigments of cellular respiration is

Correct AnswerverifiedShow Answer

The methanogens,producers of methane gas,require environments that

Correct AnswerverifiedShow Answer

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Correct AnswerverifiedShow Answer

You inoculate the bacterium into 3 tubes of nutrient broth medium containing salt--0.5% NaCl,5% NaCl,and 15% NaCl.After incubation,you notice that the organism is growing very well in the 15%,and somewhat in the 5%.There is no growth in the third tube.This organism would be called:

Correct AnswerverifiedShow Answer

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Correct AnswerverifiedShow Answer

A change in one partner,in a close relationship,that leads to a change in the other partner is

Correct AnswerverifiedShow Answer

The degree of turbidity in a broth culture correlates to the amount of cell growth.

Correct AnswerverifiedShow Answer

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called

Correct AnswerverifiedShow Answer

When it is important to count the number of cells,determine cell size,and differentiate between dead and live cells,a/n ___ is used.

Correct AnswerverifiedShow Answer

Mediated transport of polar molecules and ions across the plasma membrane utilizes a/n _____ carrier that will bind to the substance,effecting a conformational change that allows movement across the membrane.

Correct AnswerverifiedShow Answer

The milk that you bought from a grocery store a month ago got pushed to the back of the refrigerator hidden by other objects.Finding it a month later,unopened,you would like to now use it.Which statement is true?

Correct AnswerverifiedShow Answer

You have inoculated your Clostridium species into a tube of media.After incubation,you find that it is not growing and you then realize that this organism is an obligate anaerobe.What is the best explanation for this lack of growth?

Correct AnswerverifiedShow Answer

The production of antibiotics is a form of antagonism called

Correct AnswerverifiedShow Answer

Planktonic bacteria are more susceptible to antibiotics as compared to biofilm microorganisms.

Correct AnswerverifiedShow Answer

The term facultative refers to

Correct AnswerverifiedShow Answer

Anaerobes can be cultured in a CO₂ environment.

Correct Answer
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In the viable plate count method,a measured sample of a culture is evenly spread across an agar surface and incubated.Each _ represents one _ from the sample.

Correct Answer
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