Question 1

Pathogen virulence NEVER changes throughout a host's life.

Accepted Answer

A) True 
 B)False

Question 2

The macromolecules responsible for bacterial adherence that are NOT covalently attached to bacteria are collectively called

Accepted Answer

A) lipid A. 
B) biofilms. 
C) capsules. 
D) glycocalyx. 
A) lipid A. 
B) biofilms. 
C) capsules. 
D) glycocalyx.

Question 3

Clostridium botulinum cannot produce toxins in improperly preserved foods.

Accepted Answer

A) True 
 B)False

Question 4

The number of Vibrio cholera cells necessary to produce cholera in an exposed individual is drastically reduced if the individual is malnourished.

Accepted Answer

A) True 
 B)False

Question 5

The human gastrointestinal tract includes all of the following EXCEPT the

Accepted Answer

A) small intestine. 
B) stomach. 
C) large intestine. 
D) epiglottis. 
A) small intestine. 
B) stomach. 
C) large intestine. 
D) epiglottis.

Question 6

Which genus produces hyaluronidase?

Accepted Answer

A) Mycobacteria 
B) Streptococcus 
C) Shigella 
D) Procholorococcus 
A) Mycobacteria 
B) Streptococcus 
C) Shigella 
D) Procholorococcus

Question 7

The toxic lipopolysaccharides produced by MOST gram-negative bacteria are called exotoxins.

Accepted Answer

A) True 
 B)False

Question 8

The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as

Accepted Answer

A) Antigen dose₅₀. 
B) Virulence-50. 
C) LD₅₀ (lethal dose₅₀). 
D) Death rate-50. 
A) Antigen dose₅₀. 
B) Virulence-50. 
C) LD₅₀ (lethal dose₅₀). 
D) Death rate-50.

Question 9

Gram-positive bacteria produce endotoxins.

Accepted Answer

A) True 
 B)False

Exam 23: Microbial Interactions With Humans

Pathogen virulence NEVER changes throughout a host's life.

The macromolecules responsible for bacterial adherence that are NOT covalently attached to bacteria are collectively called

Clostridium botulinum cannot produce toxins in improperly preserved foods.

The number of Vibrio cholera cells necessary to produce cholera in an exposed individual is drastically reduced if the individual is malnourished.

The human gastrointestinal tract includes all of the following EXCEPT the

Which genus produces hyaluronidase?

The toxic lipopolysaccharides produced by MOST gram-negative bacteria are called exotoxins.

The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as

Gram-positive bacteria produce endotoxins.

Microorganisms and Microbiology

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Molecular Biology

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Microbial Evolution and Systematics

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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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