Question 1

In S-I-R models of infectious disease transmission, R represents _____ individuals.

Accepted Answer

A)   resistant
B)   recovered
C)   relocated
D)   resilient

Question 2

Unlike predators, most parasites do not kill their hosts. Why is this beneficial?

Accepted Answer

Because parasites rely on their hosts fo...

Question 3

Which of the following is NOT an assumption of the S-I-R model?

Accepted Answer

A)   There are no births of new susceptible individuals.
B)   Individuals retain any resistance they develop.
C)   The epidemic continues until all individuals are resistant or there are too few susceptible individuals to sustain the spread of the disease.
D)   All infected individuals die.

Question 4

What types of endoparasites replicate by altering their host's proteins and do not contain any nucleic acids?

Accepted Answer

A)   viruses
B)   hemiparasites
C)   helminths
D)   prions

Question 5

(Figure 15.15) In the figure showing dynamics of an infected population over time, what the curves A, B, and C represent?

Accepted Answer

Curve A is the percentage of individuals...

Question 6

What does the S-I-R model characterize for infectious diseases?

Accepted Answer

A)   immunity rates
B)   treatments
C)   fatality rates
D)   transmission

Question 7

Diseases such as HIV and African sleeping sickness can avoid the host's immune system by

Accepted Answer

A)   having little negative effect on the host.
B)   making themselves undetectable.
C)   living in a reservoir species.
D)   resembling red blood cells.

Question 8

Which of the following is NOT an example of horizontal transmission through a vector?

Accepted Answer

A)   transmission of the flu virus between adult humans
B)   transmission of West Nile virus between bird conspecifics via a mosquito
C)   transmission of HIV to a human infant from its mother via breast milk
D)   transmission of liver fluke to a sheep via a helminth

Question 9

The amphibian pathogen the chytrid fungus does not fit the S-I-R model because

Accepted Answer

A)   the host does not recover from the fungal infection.
B)   the host has no resistance to the fungus.
C)   the fungus kills the host.
D)   the fungus infects many species of amphibians.

Question 10

Mice infected with Toxoplasma gondii are often attracted to bobcat urine. This is an example of

Accepted Answer

A)   a host adaptation.
B)   coevolution.
C)   a parasite adaptation.
D)   a reservoir species adaptation.

Question 11

When parasites require a series of hosts to complete their life cycle, they often evolve adaptations that

Accepted Answer

A)   help them reproduce more quickly.
B)   help them get transmitted from one host to the next.
C)   protect them from multiple hosts' immune systems.
D)   allow them to reproduce in any of their hosts.

Question 12

Because of its relationship with its host, the ectoparasite has

Accepted Answer

A)   low exposure to the host's immune system.
B)   low exposure to its natural enemies.
C)   low exposure to the external environment.
D)   difficulty moving between hosts.

Question 13

Which of the following statements is NOT true about the endoparasite life cycle?

Accepted Answer

A)   It has low exposure to its natural enemies.
B)   It has low exposure to the host's immune system.
C)   It finds it easy to feed on the host.
D)   It hags low exposure to the external environment.

Question 14

Which species is a reservoir for Borrelia burgdorferi, the bacterium that causes Lyme disease?

Accepted Answer

A)   deer
B)   mouse
C)   dog
D)   human

Question 15

Organisms that produce antibacterial or antifungal chemicals have developed this ability as the result of

Accepted Answer

A)   coevolution.
B)   a parasite adaptation.
C)   a host adaptation.
D)   a prey adaptation.

Question 16

Malaria in humans and animals is caused by

Accepted Answer

A)   a prion.
B)   a protozoan.
C)   a fungus.
D)   a virus.

Question 17

In S-I-R models, which of the following does NOT determine the proportion of S, I, and R individuals in a population?

Accepted Answer

A)   recovery of infected individuals
B)   rates of transmission of the disease
C)   acquisition of immunity
D)   birth of new susceptible individuals

Question 18

A parasite moving between individuals other than parents and their offspring uses _____ transmission.

Accepted Answer

A)   horizontal
B)   vertical
C)   diagonal
D)   vector

Question 19

Which of the following diseases has the highest R0 value?

Accepted Answer

A)   HIV
B)   malaria
C)   measles
D)   chicken pox

Question 20

Vertical transmission of parasites is

Accepted Answer

A)   intraspecific transmission through a vector.
B)   interspecific transmission through a vector.
C)   direct transmission from parent to offspring.
D)   direct interspecific transmission.

Exam 15: Parasitism and Infectious Diseases

Diseases such as HIV and African sleeping sickness can avoid the host's immune system by

Correct AnswerverifiedShow Answer

When parasites require a series of hosts to complete their life cycle, they often evolve adaptations that

Correct AnswerverifiedShow Answer

Which of the following is NOT an assumption of the S-I-R model?

Correct AnswerverifiedShow Answer

Organisms that produce antibacterial or antifungal chemicals have developed this ability as the result of

Correct AnswerverifiedShow Answer

What does the S-I-R model characterize for infectious diseases?

Correct AnswerverifiedShow Answer

In S-I-R models, which of the following does NOT determine the proportion of S, I, and R individuals in a population?

Correct AnswerverifiedShow Answer

A parasite moving between individuals other than parents and their offspring uses _____ transmission.

Correct AnswerverifiedShow Answer

Malaria in humans and animals is caused by

Correct AnswerverifiedShow Answer

The amphibian pathogen the chytrid fungus does not fit the S-I-R model because

Correct AnswerverifiedShow Answer

What types of endoparasites replicate by altering their host's proteins and do not contain any nucleic acids?

Correct AnswerverifiedShow Answer

Which of the following statements is NOT true about the endoparasite life cycle?

Correct AnswerverifiedShow Answer

Mice infected with Toxoplasma gondii are often attracted to bobcat urine. This is an example of

Correct AnswerverifiedShow Answer

Vertical transmission of parasites is

Correct AnswerverifiedShow Answer

(Figure 15.15) In the figure showing dynamics of an infected population over time, what the curves A, B, and C represent?

Correct AnswerverifiedCurve A is the percentage of individuals...View AnswerShow Answer

Which species is a reservoir for Borrelia burgdorferi, the bacterium that causes Lyme disease?

Correct AnswerverifiedShow Answer

Which of the following diseases has the highest R0 value?

Correct AnswerverifiedShow Answer

In S-I-R models of infectious disease transmission, R represents _____ individuals.

Correct AnswerverifiedShow Answer

Unlike predators, most parasites do not kill their hosts. Why is this beneficial?

Correct AnswerverifiedBecause parasites rely on their hosts fo...View AnswerShow Answer

Which of the following is NOT an example of horizontal transmission through a vector?

Correct AnswerverifiedShow Answer

Because of its relationship with its host, the ectoparasite has

Correct AnswerverifiedShow Answer

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Curve A is the percentage of individuals...
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Which of the following diseases has the highest R₀ value?

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Because parasites rely on their hosts fo...
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