Question 1

The term __________ refers to the degree or intensity of pathogenicity.

Accepted Answer

The answer of The term __________ refers to the degree...

Question 2

Listeria monocytogenes propels itself through mammalian host cells using

Accepted Answer

A)  a modified form of gliding motility.
B)  host cell actin and other cytoskeletal proteins.
C)  periplasmic flagella.
D)  fimbriae-based twitching motility.E) None of the above
F) All of the above B

Question 3

Macrophages are phagocytic cells.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following must a pathogen possess in order for it to be successful at causing infectious disease?

Accepted Answer

A)  Ability to be transported initially to the host
B)  Ability to exit the host
C)  Ability to adhere to,colonize,or invade the host
D)  Ability to damage the host
E)  All of the choices are correct.F) A) and E)
G) A) and B)

Question 5

An animal that is infected with a parasitic organism that can also infect humans is called a(n) ________ host.

Accepted Answer

A)  reservoir
B)  endoparasitic
C)  transfer
D)  intermediateE) A) and B)
F) All of the above

Question 6

Bacteria within biofilms exchange

Accepted Answer

A)  plasmids.
B)  quorum-sensing molecules.
C)  nutrients.
D)  All of the choices are correct.E) A) and B)
F) None of the above

Question 7

The term "sexually transmitted infection" is more accurate than "sexually transmitted disease" because it is a sexually transmitted pathogen may colonize host tissues without causing further damage to the host.

Accepted Answer

A) True 
 B)False

Question 8

Endotoxins include which of the following?

Accepted Answer

A)  Diphtheria toxin
B)  Lipopolysaccharide
C)  Tetanus toxin
D)  Botulinum toxinE) None of the above
F) C) and D)

Question 9

Many bacteria are pathogenic because they carry large segments of DNA called __________ _________,which were acquired by horizontal gene transfer,and which carry genes responsible for virulence.

Accepted Answer

pathogenic...

Question 10

Virulence may be measured experimentally at the host level by the __________ __________ __________,which measures the number of pathogens that kills 50% of an experimental group of hosts within a specified amount of time.

Accepted Answer

The answer of Virulence may be measured experimentally at the...

Question 11

Because LPS is bound to the surface of bacteria,it is called a(n)__________.

Accepted Answer

The answer of Because LPS is bound to the surface...

Question 12

The final outcome of most host-parasite relationships depends on

Accepted Answer

A)  the number of organisms present in or on the host.
B)  the virulence of the organism.
C)  the host's defenses.
D)  All of the choices are correct.E) A) and B)
F) A) and D)

Question 13

A person who is infected with a potential pathogen fails to develop signs or symptoms of disease.This correlates with initial microbial dose, microbial lethality,and/or replication rate of the pathogen.

Accepted Answer

A)  low; high; low
B)  low; low; high
C)  high; low; low
D)  high; low; highE) A) and B)
F) B) and C)

Question 14

The only organisms to produce endotoxins are Gram-negative bacteria.

Accepted Answer

A) True 
 B)False

Question 15

Pathogenicity islands are typically associated with

Accepted Answer

A)  genes encoding tRNA.
B)  genes encoding rRNA.
C)  G+C content similar to the rest of the bacterial genome.
D)  None of the choices are correct.E) A) and B)
F) A) and C)

Question 16

Which of the following is a facultative,rather than obligate,intracellular pathogen?

Accepted Answer

A)  Chlamydia
B)  Brucella
C)  Rickettsia
D)  All of the choices are correct.E) None of the above
F) C) and D)

Question 17

Endotoxin is released when

Accepted Answer

A)  Gram-negative pathogens lyse or divide.
B)  cells are starved for iron.
C)  cells are lysogenic for the beta phage.
D)  All of the choices are correct.E) C) and D)
F) A) and C) A

Question 18

Exotoxins can be denatured by iodine to form __________,which are useful in vaccines.

Accepted Answer

toxoids

Question 19

A patient develops a high fever due to a Gram-negative pathogen.Which of the following is a certain mediator of illness in this case?

Accepted Answer

A)  Endotoxin
B)  Exotoxin
C)  Both endotoxin and exotoxin
D)  Neither endotoxin nor exotoxinE) A) and D)
F) B) and C)

Question 20

Fever response can be triggered by an endogenous pyrogen called interleukin-1.

Accepted Answer

A) True 
 B)False

Exam 35: Pathogenicity and Infection

The term __________ refers to the degree or intensity of pathogenicity.

Correct AnswerverifiedShow Answer

Listeria monocytogenes propels itself through mammalian host cells using

Correct AnswerverifiedB

Macrophages are phagocytic cells.

Correct AnswerverifiedShow Answer

Which of the following must a pathogen possess in order for it to be successful at causing infectious disease?

Correct AnswerverifiedShow Answer

An animal that is infected with a parasitic organism that can also infect humans is called a(n) ________ host.

Correct AnswerverifiedShow Answer

Bacteria within biofilms exchange

Correct AnswerverifiedShow Answer

The term "sexually transmitted infection" is more accurate than "sexually transmitted disease" because it is a sexually transmitted pathogen may colonize host tissues without causing further damage to the host.

Correct AnswerverifiedShow Answer

Endotoxins include which of the following?

Correct AnswerverifiedShow Answer

Many bacteria are pathogenic because they carry large segments of DNA called __________ _________,which were acquired by horizontal gene transfer,and which carry genes responsible for virulence.

Correct Answerverifiedpathogenic...View AnswerShow Answer

Virulence may be measured experimentally at the host level by the __________ __________ __________,which measures the number of pathogens that kills 50% of an experimental group of hosts within a specified amount of time.

Correct AnswerverifiedShow Answer

Because LPS is bound to the surface of bacteria,it is called a(n)__________.

Correct AnswerverifiedShow Answer

The final outcome of most host-parasite relationships depends on

Correct AnswerverifiedShow Answer

A person who is infected with a potential pathogen fails to develop signs or symptoms of disease.This correlates with initial microbial dose, microbial lethality,and/or replication rate of the pathogen.

Correct AnswerverifiedShow Answer

The only organisms to produce endotoxins are Gram-negative bacteria.

Correct AnswerverifiedShow Answer

Pathogenicity islands are typically associated with

Correct AnswerverifiedShow Answer

Which of the following is a facultative,rather than obligate,intracellular pathogen?

Correct AnswerverifiedShow Answer

Endotoxin is released when

Correct AnswerverifiedA

Exotoxins can be denatured by iodine to form __________,which are useful in vaccines.

Correct Answerverifiedtoxoids

A patient develops a high fever due to a Gram-negative pathogen.Which of the following is a certain mediator of illness in this case?

Correct AnswerverifiedShow Answer

Fever response can be triggered by an endogenous pyrogen called interleukin-1.

Correct AnswerverifiedShow Answer

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Many bacteria are pathogenic because they carry large segments of DNA called __ _,which were acquired by horizontal gene transfer,and which carry genes responsible for virulence.

Correct Answer
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pathogenic...
View Answer

Virulence may be measured experimentally at the host level by the __,which measures the number of pathogens that kills 50% of an experimental group of hosts within a specified amount of time.

Correct Answer
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A

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toxoids

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