Question 1

A DNA similarity of 75% between two organisms

Accepted Answer

A) suggests the organisms are very closely related at the species level. 
B) suggests the organisms are not related. 
C) suggests the organisms may or may not be related. 
D) means the GC content is 45%. 
A) suggests the organisms are very closely related at the species level. 
B) suggests the organisms are not related. 
C) suggests the organisms may or may not be related. 
D) means the GC content is 45%. A

Question 2

Streptococcus pyogenes would be

Accepted Answer

A) beta hemolytic and catalase negative. 
B) beta hemolytic and catalase positive. 
C) alpha hemolytic and catalase negative. 
D) alpha hemolytic and catalase positive. 
A) beta hemolytic and catalase negative. 
B) beta hemolytic and catalase positive. 
C) alpha hemolytic and catalase negative. 
D) alpha hemolytic and catalase positive. A

Question 3

DNA probes have been very useful in

Accepted Answer

A) coding the DNA of organisms grown in vivo. 
B) identifying organisms in pure culture. 
C) detecting toxins. 
D) diagnosing diseases of protozoa. 
A) coding the DNA of organisms grown in vivo. 
B) identifying organisms in pure culture. 
C) detecting toxins. 
D) diagnosing diseases of protozoa. B

Question 4

To study the phylogeny of eukaryotes,

Accepted Answer

A) 16S rRNA is used. 
B) 18S rRNA is used. 
C) 40S rRNA is used. 
D) 80S rRNA is used. 
A) 16S rRNA is used. 
B) 18S rRNA is used. 
C) 40S rRNA is used. 
D) 80S rRNA is used.

Question 5

A selective growth medium

Accepted Answer

A) allows only certain bacteria to grow. 
B) allows all bacteria to grow. 
C) allows no bacteria to grow. 
D) accentuates differences between the growing bacteria. 
A) allows only certain bacteria to grow. 
B) allows all bacteria to grow. 
C) allows no bacteria to grow. 
D) accentuates differences between the growing bacteria.

Question 6

Two isolates with identical RFLPs are considered

Accepted Answer

A) the same strain. 
B) different strains. 
C) possibly the same strain. 
D) different genera. 
A) the same strain. 
B) different strains. 
C) possibly the same strain. 
D) different genera.

Question 7

The basic taxonomic unit in the classification scheme of plants and animals is

Accepted Answer

A) kingdom. 
B) class. 
C) order. 
D) genus. 
E) species. 
A) kingdom. 
B) class. 
C) order. 
D) genus. 
E) species.

Question 8

In

Accepted Answer

A) specific type of DNA present. 
B) specific genus. 
C) general family. 
D) the specific LPS and flagella type present. 
E) coli O157:H7,the O157:H7 refers to the 
A) specific type of DNA present. 
B) specific genus. 
C) general family. 
D) the specific LPS and flagella type present. 
E) coli O157:H7,the O157:H7 refers to the

Question 9

In 1908 Orla-Jensen suggested that bacteria be grouped according to their

Accepted Answer

A) arrangement. 
B) morphology. 
C) physiology. 
D) Gram stain. 
A) arrangement. 
B) morphology. 
C) physiology. 
D) Gram stain.

Question 10

Streptococcus pyogenes can be easily distinguished microscopically from other Streptococcus species.

Accepted Answer

A) True 
 B)False

Question 11

Based on DNA hybridization,humans and chimpanzees are the same species.

Accepted Answer

A) True 
 B)False

Question 12

Modern approaches to evolutionary taxonomy often involve

Accepted Answer

A) biochemical differences. 
B) comparison of DNA and RNA. 
C) protein similarities. 
D) lactose fermentation. 
A) biochemical differences. 
B) comparison of DNA and RNA. 
C) protein similarities. 
D) lactose fermentation.

Question 13

Which technique(s)is/are used to help identify and classify bacteria?

Accepted Answer

A) Microscopic examination 
B) Culture characteristics 
C) Biochemical tests 
D) Nucleic acid analysis 
E) All of the choices are correct. 
A) Microscopic examination 
B) Culture characteristics 
C) Biochemical tests 
D) Nucleic acid analysis 
E) All of the choices are correct.

Question 14

Why might it be easier to determine the bacterium that caused pneumonia than one that caused a wound infection?

Accepted Answer

A) There are very few microorganisms that can cause pneumonia,while there are many that can cause wound infections. 
B) Bacteria that cause pneumonia can be identified with few tests.Many bacteria are normally found on the skin and may be in the wound complicationg indentification of the pathogen. 
C) We have much better tests for bacteria in the lungs than we do in wounds. 
D) The techniques of 16S rRNA sequencing are easier to perform on a sample taken from the lungs than a sample taken from a wound. 
A) There are very few microorganisms that can cause pneumonia,while there are many that can cause wound infections. 
B) Bacteria that cause pneumonia can be identified with few tests.Many bacteria are normally found on the skin and may be in the wound complicationg indentification of the pathogen. 
C) We have much better tests for bacteria in the lungs than we do in wounds. 
D) The techniques of 16S rRNA sequencing are easier to perform on a sample taken from the lungs than a sample taken from a wound.

Question 15

Serological methods

Accepted Answer

A) are useful in identifying bacteria. 
B) rely on the specificity of an antibody-antigen interaction. 
C) may be simple and rapid. 
D) All of the choices are correct. 
A) are useful in identifying bacteria. 
B) rely on the specificity of an antibody-antigen interaction. 
C) may be simple and rapid. 
D) All of the choices are correct.

Question 16

rRNA sequence comparisons are useful for determining evolutionary relationships.

Accepted Answer

A) True 
 B)False

Question 17

Why are molecular methods particularly useful for identification of microbes when they are difficult to grow?

Accepted Answer

A) While all microbes can (and should)be grown for identification purposes,sometimes it's simply faster to use a molecular technique. 
B) They AREN'T useful-growing a microbe is clearly the only way to properly identify it. 
C) Since all microbes use DNA,and we can sometimes detect and identify them through even very small amounts of their DNA,molecular methods allow us to identify microbes even when they can't be grown at all. 
D) Molecular methods are far cheaper methods than growing microbes for identification. 
A) While all microbes can (and should)be grown for identification purposes,sometimes it's simply faster to use a molecular technique. 
B) They AREN'T useful-growing a microbe is clearly the only way to properly identify it. 
C) Since all microbes use DNA,and we can sometimes detect and identify them through even very small amounts of their DNA,molecular methods allow us to identify microbes even when they can't be grown at all. 
D) Molecular methods are far cheaper methods than growing microbes for identification.

Question 18

The point at which two organisms diverged from a common ancestor

Accepted Answer

A) can be determined by comparing the nucleic acid sequences. 
B) depends on translational control. 
C) depends on metabolism. 
D) is determined on Mac Conkey's media. 
A) can be determined by comparing the nucleic acid sequences. 
B) depends on translational control. 
C) depends on metabolism. 
D) is determined on Mac Conkey's media.

Question 19

Nucleic acid techniques have great power as diagnostic tools because they may be

Accepted Answer

A) very specific. 
B) quick and easy to perform. 
C) used to enhance the growth of bacteria. 
D) used to selectively inhibit the growth of certain bacteria. 
A) very specific. 
B) quick and easy to perform. 
C) used to enhance the growth of bacteria. 
D) used to selectively inhibit the growth of certain bacteria.

Question 20

The relatedness of organisms determined by counting common characteristics

Accepted Answer

A) is called evolutionary taxonomy. 
B) is called amino acid sequences. 
C) is called DNA sequences. 
D) is called numerical taxonomy. 
E) suggests the organisms are very closely related at the species level AND means the GC content is 45%. 
A) is called evolutionary taxonomy. 
B) is called amino acid sequences. 
C) is called DNA sequences. 
D) is called numerical taxonomy. 
E) suggests the organisms are very closely related at the species level AND means the GC content is 45%.

Exam 10: Identification and Classification of Prokaryotic Organisms

A DNA similarity of 75% between two organisms

Streptococcus pyogenes would be

DNA probes have been very useful in

To study the phylogeny of eukaryotes,

A selective growth medium

Two isolates with identical RFLPs are considered

The basic taxonomic unit in the classification scheme of plants and animals is

In

In 1908 Orla-Jensen suggested that bacteria be grouped according to their

Streptococcus pyogenes can be easily distinguished microscopically from other Streptococcus species.

Based on DNA hybridization,humans and chimpanzees are the same species.

Modern approaches to evolutionary taxonomy often involve

Which technique(s)is/are used to help identify and classify bacteria?

Why might it be easier to determine the bacterium that caused pneumonia than one that caused a wound infection?

Serological methods

rRNA sequence comparisons are useful for determining evolutionary relationships.

Why are molecular methods particularly useful for identification of microbes when they are difficult to grow?

The point at which two organisms diverged from a common ancestor

Nucleic acid techniques have great power as diagnostic tools because they may be

The relatedness of organisms determined by counting common characteristics

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Dynamics of Prokaryotic Growth

Control of Microbial Growth

Metabolism: Fueling Cell Growth

The Blueprint of Life, From DNA to Protein

Bacterial Genetics

Biotechnology and Recombinant DNA

The Diversity of Prokaryotic Organisms

The Eukaryotic Members of the Microbial World

Viruses, Viroids, and Prions

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunologic Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Genitourinary Tract Infections

Filters