Question 1

The procedure for culturing a microorganism requires the use of a microscope.

Accepted Answer

A) True 
 B)False

Question 2

The _____ of the microscope holds and allows selection of the objective lenses.

Accepted Answer

The answer of The _____ of the microscope holds and...

Question 3

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 differential.F) A) and B)
G) A) and C)

Question 4

Bacteria that require special growth factors and complex organic substances are called

Accepted Answer

A)  fastidious.
B)  pathogenic.
C)  harmless.
D)  anaerobic.
E)  aerobic.F) A) and E)
G) B) and C)

Question 5

Which of the following reagents reacts with crystal violet as the mordant?

Accepted Answer

A)  Crystal violet
B)  Gram's iodine
C)  95% ethyl alcohol
D)  SafraninE) B) and C)
F) A) and B)

Question 6

All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except

Accepted Answer

A)  0.2 µm.
B)  0.2 mm.
C)  0.1 µm.
D)  0.3 µm.
E)  2.0 µm.F) A) and E)
G) None of the above

Question 7

The type of microscope in which you would see brightly illuminated specimens against a black background is

Accepted Answer

A)  bright-field.
B)  dark-field.
C)  phase-contrast.
D)  fluorescence.
E)  electron.F) A) and E)
G) A) and B)

Question 8

Basic dyes are

Accepted Answer

A)  attracted to the acidic substances of bacterial cells.
B)  anionic.
C)  used in negative staining.
D)  repelled by cells.
E)  dyes such as India ink and nigrosin.F) B) and D)
G) A) and E)

Question 9

How will

Accepted Answer

A)  Gram-positive
B)  Gram-negative
C)  Gram-variable
D)  None of these
E)  coli appear if the mordant is not applied?F) B) and C)
G) A) and E)

Question 10

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) A) and B)
G) C) and D)

Question 11

The primary purpose of staining cells on a microscope slide is to

Accepted Answer

A)  kill them.
B)  secure them to the slide.
C)  enlarge the cells.
D)  add contrast in order to see them better.
E)  see motility.F) A) and B)
G) A) and C)

Question 12

_____ 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 13

Which of the following will result when 1% to 5% agar is added to nutrient broth, boiled and cooled?

Accepted Answer

A)  a pure culture
B)  a mixed culture
C)  a solid medium
D)  a liquid medium
E)  a contaminated mediumF) C) and E)
G) B) and D)

Question 14

The specimen preparation that is best for viewing cell motility is

Accepted Answer

A)  hanging drop.
B)  fixed stained smear.
C)  gram stain.
D)  negative stain.
E)  flagellar stain.F) B) and D)
G) A) and D)

Question 15

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) C) and D)
G) B) and D)

Question 16

Brain-heart infusion, trypticase soy agar (TSA) , and nutrient agar are all examples of which type of media?

Accepted Answer

A)  synthetic
B)  reducing
C)  enriched
D)  nonsynthetic
E)  selectiveF) A) and B)
G) None of the above

Question 17

A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed

Accepted Answer

A)  complex.
B)  reducing.
C)  enriched.
D)  enumeration.
E)  synthetic.F) A) and B)
G) A) and C)

Question 18

Explain the difference and significance between a contaminated culture and a mixed culture.

Accepted Answer

A contaminated culture refers to a cultu...

Question 19

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 E)
G) All of the above

Question 20

A contaminated food sample contains several different species of bacteria.A food microbiologist is interested in studying just one of these species.Describe the sequence of procedures that the microbiologist must perform in order to obtain a pure culture of the bacterial species of interest from this food sample.Detail all the necessary media and equipment.

Accepted Answer

The microbiologist must first obtain a s...

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

The type of microscope in which you would see brightly illuminated specimens against a black background is

Correct Answer
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The _____ of the microscope holds and allows selection of the objective lenses.

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

Correct Answer
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How will

Correct Answer
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Correct Answer
Answered by ExamLex AI
The microbiologist must first obtain a s...
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The procedure for culturing a microorganism requires the use of a microscope.

Correct Answer
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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

All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except

Correct Answer
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The specimen preparation that is best for viewing cell motility is

Correct Answer
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Explain the difference and significance between a contaminated culture and a mixed culture.

Correct Answer
Answered by ExamLex AI
A contaminated culture refers to a cultu...
View Answer

Which of the following will result when 1% to 5% agar is added to nutrient broth, boiled and cooled?

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

Correct Answer
verified

Brain-heart infusion, trypticase soy agar (TSA) , and nutrient agar are all examples of which type of media?

Correct Answer
verified

The primary purpose of staining cells on a microscope slide is to

Correct Answer
verified

Basic dyes are

Correct Answer
verified

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

Correct Answer
verified

Which of the following reagents reacts with crystal violet as the mordant?

Correct Answer
verified

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 nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed

Correct Answer
verified

Bacteria that require special growth factors and complex organic substances are called

Correct Answer
verified

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

The type of microscope in which you would see brightly illuminated specimens against a black background is

Correct AnswerverifiedShow Answer

The _____ of the microscope holds and allows selection of the objective lenses.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How will

Correct AnswerverifiedShow Answer

Correct AnswerAnswered by ExamLex AIThe microbiologist must first obtain a s...View AnswerShow Answer

The procedure for culturing a microorganism requires the use of a microscope.

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

All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except

Correct AnswerverifiedShow Answer

The specimen preparation that is best for viewing cell motility is

Correct AnswerverifiedShow Answer

Explain the difference and significance between a contaminated culture and a mixed culture.

Correct AnswerAnswered by ExamLex AIA contaminated culture refers to a cultu...View AnswerShow Answer

Which of the following will result when 1% to 5% agar is added to nutrient broth, boiled and cooled?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Brain-heart infusion, trypticase soy agar (TSA) , and nutrient agar are all examples of which type of media?

Correct AnswerverifiedShow Answer

The primary purpose of staining cells on a microscope slide is to

Correct AnswerverifiedShow Answer

Basic dyes are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following reagents reacts with crystal violet as the mordant?

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 nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed

Correct AnswerverifiedShow Answer

Bacteria that require special growth factors and complex organic substances are called

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The microbiologist must first obtain a s...
View Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
A contaminated culture refers to a cultu...
View Answer

Correct Answer
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Correct Answer
verified

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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Correct Answer
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