Question 1

Type I and Type IV pili both

Accepted Answer

A)   are similar in mode of secretion.
B)   are mannose resistant.
C)   have an assembly that does not involve the secA general secretory pathway.
D)   are encoded by a pathogenicity island.
E)   are exclusively used for pathogenesis.F) A) and B)
G) A) and C)

Question 2

What characteristics of a pathogen distinguish it from a commensal, in terms of its ability to infect and replicate within a eukaryotic host?

Accepted Answer

Commensals are essentially relegated to ...

Question 3

Microbes can be transmitted indirectly from one person to another by inanimate objects, collectively called fomites. Describe the role of fomites in the spread of influenza.

Accepted Answer

The influenza virus can be spread by aer...

Question 4

Diphtheria toxin is a classic AB exotoxin. How does it cause host cell damage?

Accepted Answer

Diphtheria toxin is an AB toxin whose re...

Question 5

Describe what is happening at step 1 in the figure below.

Accepted Answer

There is a fusion be...

Question 6

Pathogenicity islands include all of the following EXCEPT that

Accepted Answer

A)   genes are not expressed as operons.
B)   GC/AT ratio differs from the rest of the genome.
C)   residual phage genomes flank the island.
D)   they are often linked to tRNA.
E)   they encode the type III protein secretion (T3SS)  export systems.F) A) and E)
G) B) and E)

Question 7

The term used to designate how many bacteria or viruses are required to kill 50% of an experimental group of hosts is

Accepted Answer

A)   ID50.
B)   LD50.
C)   pathogenicity.
D)   infectivity.
E)   virulence.F) None of the above
G) B) and E)

Question 8

An example of vertical transmission of infectious agents is

Accepted Answer

A)   Staphylococcus spp. gaining antibiotic resistance genes through conjugation.
B)   HIV passing from mother to child in utero.
C)   an infectious ameba obtained from a water sample.
D)   influenza being passed by a sneeze.
E)   hepatitis being transmitted by an infected needle stick.F) A) and E)
G) B) and D)

Question 9

The disease filariasis, commonly known as elephantiasis, is caused by a(n)

Accepted Answer

A)   ectoparasite.
B)   endoparasite.
C)   insect.
D)   bacterium.
E)   fungus.F) B) and C)
G) B) and E)

Question 10

Tropheryma whipplei is the causative agent for Whipple's disease. It could not be cultured until recently, when the genomic data showed that it

Accepted Answer

A)   was auxotrophic for some amino acids.
B)   was an obligate intracellular pathogen.
C)   needed a helper virus to grow.
D)   needed high levels of iron.
E)   is a virus that needs cell culture.F) None of the above
G) A) and C)

Exam 25: Microbial Pathogenesis

The disease filariasis, commonly known as elephantiasis, is caused by a(n)

Correct Answer
verified

The term used to designate how many bacteria or viruses are required to kill 50% of an experimental group of hosts is

Correct Answer
verified

Diphtheria toxin is a classic AB exotoxin. How does it cause host cell damage?

Correct Answer
verified
Diphtheria toxin is an AB toxin whose re...
View Answer

Pathogenicity islands include all of the following EXCEPT that

Correct Answer
verified

What characteristics of a pathogen distinguish it from a commensal, in terms of its ability to infect and replicate within a eukaryotic host?

Correct Answer
verified
Commensals are essentially relegated to ...
View Answer

Microbes can be transmitted indirectly from one person to another by inanimate objects, collectively called fomites. Describe the role of fomites in the spread of influenza.

Correct Answer
verified
The influenza virus can be spread by aer...
View Answer

An example of vertical transmission of infectious agents is

Correct Answer
verified

Type I and Type IV pili both

Correct Answer
verified

Tropheryma whipplei is the causative agent for Whipple's disease. It could not be cultured until recently, when the genomic data showed that it

Correct Answer
verified

Describe what is happening at step 1 in the figure below.

Correct Answer
verified
There is a fusion be...
View Answer

Exam 25: Microbial Pathogenesis

The disease filariasis, commonly known as elephantiasis, is caused by a(n)

Correct AnswerverifiedShow Answer

The term used to designate how many bacteria or viruses are required to kill 50% of an experimental group of hosts is

Correct AnswerverifiedShow Answer

Diphtheria toxin is a classic AB exotoxin. How does it cause host cell damage?

Correct AnswerverifiedDiphtheria toxin is an AB toxin whose re...View AnswerShow Answer

Pathogenicity islands include all of the following EXCEPT that

Correct AnswerverifiedShow Answer

What characteristics of a pathogen distinguish it from a commensal, in terms of its ability to infect and replicate within a eukaryotic host?

Correct AnswerverifiedCommensals are essentially relegated to ...View AnswerShow Answer

Microbes can be transmitted indirectly from one person to another by inanimate objects, collectively called fomites. Describe the role of fomites in the spread of influenza.

Correct AnswerverifiedThe influenza virus can be spread by aer...View AnswerShow Answer

An example of vertical transmission of infectious agents is

Correct AnswerverifiedShow Answer

Type I and Type IV pili both

Correct AnswerverifiedShow Answer

Tropheryma whipplei is the causative agent for Whipple's disease. It could not be cultured until recently, when the genomic data showed that it

Correct AnswerverifiedShow Answer

Describe what is happening at step 1 in the figure below.

Correct AnswerverifiedThere is a fusion be...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Diphtheria toxin is an AB toxin whose re...
View Answer

Correct Answer
verified

Correct Answer
verified
Commensals are essentially relegated to ...
View Answer

Correct Answer
verified
The influenza virus can be spread by aer...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
There is a fusion be...
View Answer