Question 1

One function of programmed cell death is to

Accepted Answer

A)  increase the pH of the local environment. 
B)  release antibiotic resistance compounds. 
C)  increase the solute concentration of a hypotonic solution. 
D)  decrease the pH of the local environment. 
E)  release nutrients that neighboring cells use to survive. 
A)  increase the pH of the local environment. 
B)  release antibiotic resistance compounds. 
C)  increase the solute concentration of a hypotonic solution. 
D)  decrease the pH of the local environment. 
E)  release nutrients that neighboring cells use to survive.

Question 2

The D-value of a bacterial culture heated to 100°C is the time it takes to kill ________% of the population.

Accepted Answer

A)  99 
B)  90 
C)  50 
D)  10 
E)  1 
A)  99 
B)  90 
C)  50 
D)  10 
E)  1

Question 3

All of the following are true about microbes and temperature EXCEPT

Accepted Answer

A)  microbes have mechanisms to control their temperature. 
B)  temperature affects the average rate of molecular motion. 
C)  changes in temperature affect membrane fluidity. 
D)  changes in temperature affect transport. 
E)  every organism has an optimum temperature for growth. 
A)  microbes have mechanisms to control their temperature. 
B)  temperature affects the average rate of molecular motion. 
C)  changes in temperature affect membrane fluidity. 
D)  changes in temperature affect transport. 
E)  every organism has an optimum temperature for growth.

Question 4

Which of the conditions can be labeled as "extreme"?

Accepted Answer

A)  near-neutral pH 
B)  25°C 
C)  pressure of 400 atm 
D)  a salt concentration of 0.9% 
E)  pressure of 14 psi 
A)  near-neutral pH 
B)  25°C 
C)  pressure of 400 atm 
D)  a salt concentration of 0.9% 
E)  pressure of 14 psi

Question 5

Which best describes microaerophiles?

Accepted Answer

A)  They require atmospheric oxygen levels to grow. 
B)  They cannot grow in the presence of oxygen. 
C)  They will use oxygen if it is present, but can grow even if oxygen is not present. 
D)  They require a small oxygen concentration to grow. 
E)  They can't use oxygen to grow, but oxygen won't kill them. 
A)  They require atmospheric oxygen levels to grow. 
B)  They cannot grow in the presence of oxygen. 
C)  They will use oxygen if it is present, but can grow even if oxygen is not present. 
D)  They require a small oxygen concentration to grow. 
E)  They can't use oxygen to grow, but oxygen won't kill them.

Question 6

Which of the following is NOT true concerning irradiation of foods?

Accepted Answer

A)  Food consumed by NASA astronauts is sterilized by irradiation. 
B)  Foods become radioactive when irradiated. 
C)  Viruses are resistant to doses approved for foods. 
D)  A higher dose of radiation is necessary to kill microbes in frozen foods. 
E)  It is effective in eliminating parasites and bacteria. 
A)  Food consumed by NASA astronauts is sterilized by irradiation. 
B)  Foods become radioactive when irradiated. 
C)  Viruses are resistant to doses approved for foods. 
D)  A higher dose of radiation is necessary to kill microbes in frozen foods. 
E)  It is effective in eliminating parasites and bacteria.

Question 7

Give an example of a naturally occurring organic acid stress situation in the food industry. How does the food industry mimic this, and why?

Accepted Answer

In the yogurt-making process, lactobacil

Question 8

What alkaliphile do pink flamingos eat, and how is it involved in making the flamingo pink?

Accepted Answer

The cyanobacterium Spirulina imparts a p

Question 9

The proteins and cell components of halophiles have remarkably high intracellular levels of ________, which helps to maintain their cell structure.

Accepted Answer

A)  oxygen 
B)  potassium 
C)  calcium 
D)  sodium 
E)  hydrogen 
A)  oxygen 
B)  potassium 
C)  calcium 
D)  sodium 
E)  hydrogen

Question 10

Describe three mechanisms organisms use to reduce osmotic stress.

Accepted Answer

Compatible solutes can be made or import

One function of programmed cell death is to

The D-value of a bacterial culture heated to 100°C is the time it takes to kill ________% of the population.

All of the following are true about microbes and temperature EXCEPT

Which of the conditions can be labeled as "extreme"?

Which best describes microaerophiles?

Which of the following is NOT true concerning irradiation of foods?

Give an example of a naturally occurring organic acid stress situation in the food industry. How does the food industry mimic this, and why?

What alkaliphile do pink flamingos eat, and how is it involved in making the flamingo pink?

The proteins and cell components of halophiles have remarkably high intracellular levels of ________, which helps to maintain their cell structure.

Describe three mechanisms organisms use to reduce osmotic stress.

Microbial Life: Origin and Discovery

Observing the Microbial Cell

Cell Structure and Function

Bacterial Culture, Growth, and Development

Viruses

Genomes and Chromosomes

Transcription, Translation, and Bioinformatics

Gene Transfer, Mutations, and Genome Evolution

Molecular Regulation

Viral Molecular Biology

Biotechniques and Synthetic Biology

Energetics and Catabolism

Electron Flow in Organotrophy, Lithotrophy, and Phototrophy

Biosynthesis

Food and Industrial Microbiology

Origins and Evolution

Bacterial Diversity

Archaeal Diversity

Eukaryotic Diversity

Microbial Ecology

Microbes in Global Elemental Cycles

Human Microbiota and Innate Immunity

The Adaptive Immune Response

Microbial Pathogenesis

Microbial Diseases

Antimicrobial Therapy

Clinical Microbiology and Epidemiology

Filters

Exam 5: Environmental Influences and Control of Microbial Growth

One function of programmed cell death is to

The D-value of a bacterial culture heated to 100°C is the time it takes to kill ________% of the population.

All of the following are true about microbes and temperature EXCEPT

Which of the conditions can be labeled as "extreme"?

Which best describes microaerophiles?

Which of the following is NOT true concerning irradiation of foods?

Give an example of a naturally occurring organic acid stress situation in the food industry. How does the food industry mimic this, and why?

What alkaliphile do pink flamingos eat, and how is it involved in making the flamingo pink?

The proteins and cell components of halophiles have remarkably high intracellular levels of ________, which helps to maintain their cell structure.

Describe three mechanisms organisms use to reduce osmotic stress.

Microbial Life: Origin and Discovery

Observing the Microbial Cell

Cell Structure and Function

Bacterial Culture, Growth, and Development

Viruses

Genomes and Chromosomes

Transcription, Translation, and Bioinformatics

Gene Transfer, Mutations, and Genome Evolution

Molecular Regulation

Viral Molecular Biology

Biotechniques and Synthetic Biology

Energetics and Catabolism

Electron Flow in Organotrophy, Lithotrophy, and Phototrophy

Biosynthesis

Food and Industrial Microbiology

Origins and Evolution

Bacterial Diversity

Archaeal Diversity

Eukaryotic Diversity

Microbial Ecology

Microbes in Global Elemental Cycles

Human Microbiota and Innate Immunity

The Adaptive Immune Response

Microbial Pathogenesis

Microbial Diseases

Antimicrobial Therapy

Clinical Microbiology and Epidemiology

Filters