Question 1

Which of the following media is useful for cultivating fungi?

Accepted Answer

A)  Sabouraud's agar
B)  MacConkey agar
C)  tomato juice agar
D)  phenylethanol agar
E)  Mueller telluriteF) A) and B)
G) B) and D)

Question 2

Microbes can be challenging to study because they often grow in complex communities and it may be difficult to separate the various species from one another to study individually.Which of the following laboratory "tools" or techniques may be of the the most help with separating out different species from complex mixtures?

Accepted Answer

A)  use of transmission electron microscopy
B)  use of enriched agar for culture
C)  use of selective agars for culture
D)  use of light microscopyE) A) and B)
F) A) and C)

Question 3

All of the following are examples of different types of microbiological media except

Accepted Answer

A)  broth.
B)  enriched.
C)  agar.
D)  Petri dish.
E)  gelatin.F) B) and D)
G) C) and D)

Question 4

Bacteria that require special growth factors and complex nutrients are termed _____.

Accepted Answer

The answer of Bacteria that require special growth factors and...

Question 5

If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?

Accepted Answer

A)  100X
B)  950X
C)  85X
D)  850X
E)  95XF) A) and C)
G) C) and E)

Question 6

A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium.Following incubation, only the E.coli grows in the culture.What is the most likely explanation?

Accepted Answer

A)  The microbiologist used too much inoculum.
B)  The culture is contaminated.
C)  The incubation temperature was incorrect.
D)  The culture medium must be selective.
E)  The culture medium must be differentialF) A) and B)
G) B) and E)

Question 7

A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue.All the cells appear blue under the oil lens.This is an example of

Accepted Answer

A)  negative staining.
B)  using an acidic dye.
C)  simple staining.
D)  using the acid-fast stain.
E)  capsule staining.F) All of the above
G) A) and B)

Question 8

A reducing medium contains

Accepted Answer

A)  sugars that can be fermented.
B)  extra oxygen.
C)  hemoglobin, vitamins, or other growth factors.
D)  substances that remove oxygen.
E)  inhibiting agents.F) A) and E)
G) B) and E)

Question 9

The bending of light rays as they pass from one medium to another is called refraction.

Accepted Answer

A) True 
 B)False

Question 10

Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?

Accepted Answer

A)  fluorescence
B)  differential interference contrast
C)  scanning electron
D)  transmission electron
E)  phase-contrastF) A) and B)
G) None of the above

Question 11

Compare and contrast the reagents and functions of negative staining versus positive staining.

Accepted Answer

Negative staining and positive staining ...

Question 12

Mannitol salt agar is selective for which bacterial genus?

Accepted Answer

A)  Salmonella
B)  Streptococcus
C)  Neisseria
D)  Staphylococcus
E)  EscherichiaF) None of the above
G) B) and D)

Question 13

A selective medium contains one or more substances that inhibit growth of certain microbes in order to facilitate the growth of other microbes.

Accepted Answer

A) True 
 B)False

Question 14

Which type of media can be used to determine if a bacteria is motile?

Accepted Answer

A)  SIM
B)  MacConkey
C)  enriched media
D)  Thayer-Martin media
E)  chocolate agarF) A) and B)
G) All of the above

Question 15

How will E. coli appear if the mordant is not applied?

Accepted Answer

A)  gram-positive
B)  gram-negative
C)  gram-variable
D)  colorlessE) C) and D)
F) B) and D)

Question 16

The Gram stain, acid-fast stain, and endospore stain ____________.

Accepted Answer

A)  are used on a wet mount of the specimen
B)  use heat to force the dye into cell structures
C)  have outcomes based on cell wall differences
D)  use a negative stain technique
E)  are differential stainsF) B) and E)
G) None of the above

Question 17

Which of the following characteristics refers to the microscope's ability to show two separate entities as separate and distinct?

Accepted Answer

A)  resolving power
B)  magnification
C)  refraction
D)  All of these choices are correct.E) A) and C)
F) B) and D)

Question 18

_____ dyes have a negative charge on the chromophore and are repelled by bacterial cells.

Accepted Answer

The answer of _____ dyes have a negative charge on...

Question 19

The three physical forms of laboratory media are: solid, semisolid, and _____.

Accepted Answer

The answer of The three physical forms of laboratory media...

Question 20

A media is designed that allows only staphylococci to grow.In addition, S.aureus colonies have a yellow halo around them and other staphylococci appear white.This type of media is

Accepted Answer

A)  selective only.
B)  differential only.
C)  both selective and differential.
D)  a reducing media.
E)  enriched.F) B) and C)
G) A) and B)

Exam 3: Tools of the Laboratory: Methods of Studying Microorganisms

_____ dyes have a negative charge on the chromophore and are repelled by bacterial cells.

Correct Answer
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Correct Answer
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Mannitol salt agar is selective for which bacterial genus?

Correct Answer
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Bacteria that require special growth factors and complex nutrients are termed _____.

Correct Answer
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If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?

Correct Answer
verified

The Gram stain, acid-fast stain, and endospore stain ____________.

Correct Answer
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Compare and contrast the reagents and functions of negative staining versus positive staining.

Correct Answer
Answered by ExamLex AI
Negative staining and positive staining ...
View Answer

Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?

Correct Answer
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A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium.Following incubation, only the E.coli grows in the culture.What is the most likely explanation?

Correct Answer
verified

A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue.All the cells appear blue under the oil lens.This is an example of

Correct Answer
verified

The three physical forms of laboratory media are: solid, semisolid, and _____.

Correct Answer
verified

A media is designed that allows only staphylococci to grow.In addition, S.aureus colonies have a yellow halo around them and other staphylococci appear white.This type of media is

Correct Answer
verified

A reducing medium contains

Correct Answer
verified

How will E. coli appear if the mordant is not applied?

Correct Answer
verified

Which type of media can be used to determine if a bacteria is motile?

Correct Answer
verified

The bending of light rays as they pass from one medium to another is called refraction.

Correct Answer
verified

Which of the following characteristics refers to the microscope's ability to show two separate entities as separate and distinct?

Correct Answer
verified

All of the following are examples of different types of microbiological media except

Correct Answer
verified

A selective medium contains one or more substances that inhibit growth of certain microbes in order to facilitate the growth of other microbes.

Correct Answer
verified

Which of the following media is useful for cultivating fungi?

Correct Answer
verified

Exam 3: Tools of the Laboratory: Methods of Studying Microorganisms

_____ dyes have a negative charge on the chromophore and are repelled by bacterial cells.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Mannitol salt agar is selective for which bacterial genus?

Correct AnswerverifiedShow Answer

Bacteria that require special growth factors and complex nutrients are termed _____.

Correct AnswerverifiedShow Answer

If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?

Correct AnswerverifiedShow Answer

The Gram stain, acid-fast stain, and endospore stain ____________.

Correct AnswerverifiedShow Answer

Compare and contrast the reagents and functions of negative staining versus positive staining.

Correct AnswerAnswered by ExamLex AINegative staining and positive staining ...View AnswerShow Answer

Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?

Correct AnswerverifiedShow Answer

A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium.Following incubation, only the E.coli grows in the culture.What is the most likely explanation?

Correct AnswerverifiedShow Answer

A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue.All the cells appear blue under the oil lens.This is an example of

Correct AnswerverifiedShow Answer

The three physical forms of laboratory media are: solid, semisolid, and _____.

Correct AnswerverifiedShow Answer

A media is designed that allows only staphylococci to grow.In addition, S.aureus colonies have a yellow halo around them and other staphylococci appear white.This type of media is

Correct AnswerverifiedShow Answer

A reducing medium contains

Correct AnswerverifiedShow Answer

How will E. coli appear if the mordant is not applied?

Correct AnswerverifiedShow Answer

Which type of media can be used to determine if a bacteria is motile?

Correct AnswerverifiedShow Answer

The bending of light rays as they pass from one medium to another is called refraction.

Correct AnswerverifiedShow Answer

Which of the following characteristics refers to the microscope's ability to show two separate entities as separate and distinct?

Correct AnswerverifiedShow Answer

All of the following are examples of different types of microbiological media except

Correct AnswerverifiedShow Answer

A selective medium contains one or more substances that inhibit growth of certain microbes in order to facilitate the growth of other microbes.

Correct AnswerverifiedShow Answer

Which of the following media is useful for cultivating fungi?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
Answered by ExamLex AI
Negative staining and positive staining ...
View Answer

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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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