Question 1

Atmospheric nitrogen gas (N₂₎ is produced in the process known as nitrogen fixation.

Accepted Answer

A) True 
 B)False

Question 2

Organisms that require organic sources of carbon and energy are called (chemoheterotrophs/chemoautotrophs/autotrophs).

Accepted Answer

The answer of Organisms that require organic sources of carbon...

Question 3

Enrichment culturing may require use of controlled environmental conditions.

Accepted Answer

A) True 
 B)False

Question 4

A(n) ________ organism require(s) oxygen for growth.

Accepted Answer

A)  anaerobic 
B)  facultative anaerobic 
C)  aerotolerant 
D)  obligate aerobic 
E)  aerotolerant and an anaerobic 
A)  anaerobic 
B)  facultative anaerobic 
C)  aerotolerant 
D)  obligate aerobic 
E)  aerotolerant and an anaerobic

Question 5

A growth curve plots the (concentration/number/percentage) of viable organisms in a growing population over time.

Accepted Answer

The answer of A growth curve plots the (concentration/number/percentage) of...

Question 6

During which growth phase are bacteria more susceptible to antimicrobial drugs?

Accepted Answer

A)  lag phase 
B)  log phase 
C)  stationary phase 
D)  death phase 
E)  The susceptibility is the same for all phases. 
A)  lag phase 
B)  log phase 
C)  stationary phase 
D)  death phase 
E)  The susceptibility is the same for all phases.

Question 7

An organism that requires chemical nutrients which serve as final electron acceptors is a(n)

Accepted Answer

A)  chemotroph. 
B)  phototroph. 
C)  lithotroph. 
D)  autotroph. 
E)  aerobe. 
A)  chemotroph. 
B)  phototroph. 
C)  lithotroph. 
D)  autotroph. 
E)  aerobe.

Question 8

The growth of bacterial cultures is best described as

Accepted Answer

A)  arithmetic growth. 
B)  lag growth. 
C)  logarithmic growth. 
D)  cell division. 
E)  replication. 
A)  arithmetic growth. 
B)  lag growth. 
C)  logarithmic growth. 
D)  cell division. 
E)  replication.

Question 9

A pure culture is composed of cells that arise from a single (cell/inoculum/sample).

Accepted Answer

The answer of A pure culture is composed of cells...

Question 10

MacConkey agar plates represent ________ medium.

Accepted Answer

A)  a minimal 
B)  a selective 
C)  a differential 
D)  both a differential and a selective 
E)  both a minimal and a selective 
A)  a minimal 
B)  a selective 
C)  a differential 
D)  both a differential and a selective 
E)  both a minimal and a selective

Question 11

Obligate anaerobes may be cultured in the laboratory

Accepted Answer

A)  in a reducing medium. 
B)  in a standard incubator. 
C)  in standard Petri plates. 
D)  on blood agar plates. 
E)  in standard complex media. 
A)  in a reducing medium. 
B)  in a standard incubator. 
C)  in standard Petri plates. 
D)  on blood agar plates. 
E)  in standard complex media.

Question 12

A microorganism grows in the lab on medium containing mineral salts but no organic compounds. The organism is likely to be a(n)

Accepted Answer

A)  heterotroph. 
B)  autotroph. 
C)  chemotroph. 
D)  chemoheterotroph. 
E)  The answer cannot be determined from the information provided. 
A)  heterotroph. 
B)  autotroph. 
C)  chemotroph. 
D)  chemoheterotroph. 
E)  The answer cannot be determined from the information provided.

Question 13

Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation.

Accepted Answer

The streak-plate and the pour-plate meth

Question 14

The generation time of bacterial cells is shortest during the ________ phase.

Accepted Answer

A)  death 
B)  lag 
C)  log 
D)  stationary 
E)  longitudinal 
A)  death 
B)  lag 
C)  log 
D)  stationary 
E)  longitudinal

Question 15

Microaerophiles are microbes that grow best at low

Accepted Answer

A)  carbon dioxide levels. 
B)  pH values. 
C)  hydrostatic pressure. 
D)  oxygen levels. 
E)  salt concentrations. 
A)  carbon dioxide levels. 
B)  pH values. 
C)  hydrostatic pressure. 
D)  oxygen levels. 
E)  salt concentrations.

Question 16

Which of the following organisms would be most likely to contaminate a jar of pickles?

Accepted Answer

A)  a neutrophile 
B)  a thermophile 
C)  an acidophile 
D)  an obligate anaerobe 
E)  a mesophile 
A)  a neutrophile 
B)  a thermophile 
C)  an acidophile 
D)  an obligate anaerobe 
E)  a mesophile

Question 17

A (Coulter counter/cytometer/spectrophotometer) can measure changes in the turbidity of a bacterial culture.

Accepted Answer

The answer of A (Coulter counter/cytometer/spectrophotometer) can measure changes in...

Question 18

When cells are metabolically active but not dividing, they are in the ________ phase.

Accepted Answer

A)  stationary 
B)  log 
C)  lag 
D)  death 
E)  exponential 
A)  stationary 
B)  log 
C)  lag 
D)  death 
E)  exponential

Question 19

The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?

Accepted Answer

A)  nitrogen fixation 
B)  osmotic pressure 
C)  pH 
D)  hydrostatic pressure 
E)  quorum sensing 
A)  nitrogen fixation 
B)  osmotic pressure 
C)  pH 
D)  hydrostatic pressure 
E)  quorum sensing

Question 20

Alkalinophiles can survive in water up to pH (11.5/10/7.0).

Accepted Answer

The answer of Alkalinophiles can survive in water up to...

Exam 6: Microbial Nutrition and Growth

Atmospheric nitrogen gas (N₂₎ is produced in the process known as nitrogen fixation.

Organisms that require organic sources of carbon and energy are called (chemoheterotrophs/chemoautotrophs/autotrophs).

Enrichment culturing may require use of controlled environmental conditions.

A(n) ________ organism require(s) oxygen for growth.

A growth curve plots the (concentration/number/percentage) of viable organisms in a growing population over time.

During which growth phase are bacteria more susceptible to antimicrobial drugs?

An organism that requires chemical nutrients which serve as final electron acceptors is a(n)

The growth of bacterial cultures is best described as

A pure culture is composed of cells that arise from a single (cell/inoculum/sample).

MacConkey agar plates represent ________ medium.

Obligate anaerobes may be cultured in the laboratory

A microorganism grows in the lab on medium containing mineral salts but no organic compounds. The organism is likely to be a(n)

Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation.

The generation time of bacterial cells is shortest during the ________ phase.

Microaerophiles are microbes that grow best at low

Which of the following organisms would be most likely to contaminate a jar of pickles?

A (Coulter counter/cytometer/spectrophotometer) can measure changes in the turbidity of a bacterial culture.

When cells are metabolically active but not dividing, they are in the ________ phase.

The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?

Alkalinophiles can survive in water up to pH (11.5/10/7.0).

A Brief History of Microbiology

The Chemistry of Microbiology

Cell Structure and Function

Microscopy, Staining, and Classification

Microbial Metabolism

Microbial Genetics

Recombinant DNA Technology

Controlling Microbial Growth in the Environment

Controlling Microbial Growth in the Body: Antimicrobial Drugs

Characterizing and Classifying Prokaryotes

Characterizing and Classifying Eukaryotes

Characterizing and Classifying Viruses, Viroids, and Prions

Infection, Infectious Diseases, and Epidemiology

Innate Immunity

Adaptive Immunity

Immunization and Immune Testing

Immune Disorders

Microbial Diseases of the Skin and Wounds

Microbial Diseases of the Nervous System and Eyes

Microbial Cardiovascular and Systemic Diseases

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Diseases of the Urinary and Reproductive Systems

Applied and Industrial Microbiology

Microbial Ecology and Microbiomes

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