Question 1

The time interval required for the formation of two cells from one is called the

Accepted Answer

A) generation time. 
B) growth time. 
C) growth rate. 
D) division rate. 
A) generation time. 
B) growth time. 
C) growth rate. 
D) division rate.

Question 2

The MOST effective antibiotics in preventing growth of disease-causing bacteria are

Accepted Answer

A) bacteriocidal. 
B) bacteriostatic. 
C) bacteriolytic. 
D) bacteriolytic or bacteriocidal. 
A) bacteriocidal. 
B) bacteriostatic. 
C) bacteriolytic. 
D) bacteriolytic or bacteriocidal.

Question 3

Which of these statements is/are TRUE?

Accepted Answer

A) In general,prokaryotic organisms can grow at higher temperatures than eukaryotic organisms. 
B) The most thermophilic prokaryotes are species of Archaea. 
C) Nonphototrophic organisms are able to grow at higher temperatures than phototrophic organisms. 
D) All of the statements are true. 
A) In general,prokaryotic organisms can grow at higher temperatures than eukaryotic organisms. 
B) The most thermophilic prokaryotes are species of Archaea. 
C) Nonphototrophic organisms are able to grow at higher temperatures than phototrophic organisms. 
D) All of the statements are true.

Question 4

A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.

Accepted Answer

A) catalase 
B) superoxide dismutase 
C) superoxide reductase 
D) peroxidase 
A) catalase 
B) superoxide dismutase 
C) superoxide reductase 
D) peroxidase

Question 5

Which term is most relevant in describing the efficacy of an antimicrobial for use in a clinical setting?

Accepted Answer

A) effective dose 
B) sterilization coefficient 
C) lethal dosage 
D) minimum inhibitory concentration 
A) effective dose 
B) sterilization coefficient 
C) lethal dosage 
D) minimum inhibitory concentration

Question 6

The sensitivity of DNA and RNA is one major reason water activity can limit microbial growth.

Accepted Answer

A) True 
 B)False

Question 7

Propose a growth setup that an industrial microbiologist would create to obtain large quantities of a bacteriocidal product of secondary metabolism.Be certain to explain how temperature and dissolved oxygen parameters would be selected as well as how stationary growth phase would be maintained.

Accepted Answer

A continuous culture device (e.g.,a chem

Question 8

Some microbes can grow in boiling water.

Accepted Answer

A) True 
 B)False

Question 9

By controlling the concentration of nutrients added into a chemostat continuously,cells can constantly be maintained at

Accepted Answer

A) exponential growth phase. 
B) stationary growth phase. 
C) log or stationary growth phase. 
D) death growth phase. 
A) exponential growth phase. 
B) stationary growth phase. 
C) log or stationary growth phase. 
D) death growth phase.

Question 10

The partition that is a result of the inward growth of the cytoplasmic membrane and cell wall from opposing directions is known as the

Accepted Answer

A) divisome. 
B) septum. 
C) autolysin. 
D) colony. 
A) divisome. 
B) septum. 
C) autolysin. 
D) colony.

Question 11

An antibiotic that increased the activity of ________ would likely result in cell death.

Accepted Answer

A) autolysin 
B) binary fission 
C) stationary growth 
D) ionic bonds in proteins 
A) autolysin 
B) binary fission 
C) stationary growth 
D) ionic bonds in proteins

Question 12

Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR)technique because it does not become inactivated at high temperatures.

Accepted Answer

A) True 
 B)False

Question 13

Compare and contrast the spread plate method and the pour plate method of doing plate counts.Also describe which group of organisms would not be quantifiable in the pour plate method but would still be observed in the spread plate method.

Accepted Answer

Answers will vary,but one benefit to the

Question 14

In fast-growing Escherichia coli cells,multiple replication forks of genomic DNA allows binary fission to occur before the genome has been fully duplicated.

Accepted Answer

A) True 
 B)False

Question 15

A chemical that denatures proteins is MOST likely to be classified as a(n)________ agent.

Accepted Answer

A) antiseptic 
B) bacteriostatic 
C) bacteriocidal 
D) detergent 
A) antiseptic 
B) bacteriostatic 
C) bacteriocidal 
D) detergent

Question 16

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in thermophiles.

Accepted Answer

Thermophilic proteins typicall

Question 17

Bacteria that are able to grow in humans and cause disease have likely evolved to be

Accepted Answer

A) psychrophiles. 
B) mesophiles. 
C) thermophiles. 
D) hyperthermophiles. 
A) psychrophiles. 
B) mesophiles. 
C) thermophiles. 
D) hyperthermophiles.

Question 18

Most mesophilic organisms can grow in a temperature range of

Accepted Answer

A) 0-15°C. 
B) 10-20°C. 
C) 20-40°C. 
D) 50-65°C. 
A) 0-15°C. 
B) 10-20°C. 
C) 20-40°C. 
D) 50-65°C.

Question 19

The addition of thioglycylate into a growth medium would NOT support the growth of a(n)

Accepted Answer

A) aerotolerant anaerobe. 
B) facultative aerobe. 
C) microaerophilic aerobe. 
D) obligate anaerobe. 
A) aerotolerant anaerobe. 
B) facultative aerobe. 
C) microaerophilic aerobe. 
D) obligate anaerobe.

Question 20

A bacterium that lacks the mreB gene will have a ________ shape.

Accepted Answer

A) bacillus 
B) coccoid 
C) short bacillus 
D) vibrio 
A) bacillus 
B) coccoid 
C) short bacillus 
D) vibrio

Exam 5: Microbial Growth and Control

The time interval required for the formation of two cells from one is called the

The MOST effective antibiotics in preventing growth of disease-causing bacteria are

Which of these statements is/are TRUE?

A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.

Which term is most relevant in describing the efficacy of an antimicrobial for use in a clinical setting?

The sensitivity of DNA and RNA is one major reason water activity can limit microbial growth.

Propose a growth setup that an industrial microbiologist would create to obtain large quantities of a bacteriocidal product of secondary metabolism.Be certain to explain how temperature and dissolved oxygen parameters would be selected as well as how stationary growth phase would be maintained.

Some microbes can grow in boiling water.

By controlling the concentration of nutrients added into a chemostat continuously,cells can constantly be maintained at

The partition that is a result of the inward growth of the cytoplasmic membrane and cell wall from opposing directions is known as the

An antibiotic that increased the activity of ________ would likely result in cell death.

Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR)technique because it does not become inactivated at high temperatures.

Compare and contrast the spread plate method and the pour plate method of doing plate counts.Also describe which group of organisms would not be quantifiable in the pour plate method but would still be observed in the spread plate method.

In fast-growing Escherichia coli cells,multiple replication forks of genomic DNA allows binary fission to occur before the genome has been fully duplicated.

A chemical that denatures proteins is MOST likely to be classified as a(n)________ agent.

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in thermophiles.

Bacteria that are able to grow in humans and cause disease have likely evolved to be

Most mesophilic organisms can grow in a temperature range of

The addition of thioglycylate into a growth medium would NOT support the growth of a(n)

A bacterium that lacks the mreB gene will have a ________ shape.

Microorganisms and Microbiology

Microbial Cell Structure and Function

Microbial Metabolism

Molecular Biology

Microbial Genomics

Metabolic Regulation

Viruses and Virology

Viral Genomes and Diversity

Genetics of Bacteria and Archaea

Genetic Engineering and Biotechnology

Microbial Evolution and Systematics

Metabolic Diversity of Microorganisms

Functional Diversity of Bacteria

Diversity of Bacteria

Diversity of Archaea

Diversity of Eukaryotic Microorganisms

Methods in Microbial Ecology

Microbial Ecosystems

Nutrient Cycles

Microbiology of the Built Environment

Microbial Symbioses

Microbial Interactions With Humans

Immunity and Host Defense

Immune Mechanisms

Molecular Immunology

Diagnostic Microbiology

Epidemiology

Person-To-Person Bacterial and Viral Diseases

Vectorborne and Soilborne Bacterial and Viral Diseases

Water and Food As Vehicles of Bacterial Diseases

Eukaryotic Pathogens: Fungal and Parasitic Diseases

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