In S-I-R models, if R0 > 1,

A) the infection fails to take hold in the host population. B) the population becomes resistant to the infection. C) the infection becomes an epidemic. D) the population is immune to the infection. A) the infection fails to take hold in the host population. B) the population becomes resistant to the infection. C) the infection becomes an epidemic. D) the population is immune to the infection.

Exam 15: Parasitism and Infectious Diseases

(Figure 15.11) The graph shows survival rates for North American populations of the little brown bat (Myotis lucifugus) after exposure to either a North American or European strain of white-nose fungus (Geomyces destructans). What did researchers conclude about the two strains?

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Question 1

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Exposure to either strain of white-nose fungus caused high rates of bat death. However, bats did not die as quickly when exposed to the North American strain, which may suggest that bats in North America are evolving some resistance to the North American strain of the fungus.
Parasite and host dynamics are determined by the parasite's ability to infect the host.

The prion that causes bovine spongiform encephalopathy is _ transmitted _.

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Describe the 2-year cycle of Lyme disease, including all hosts and how the parasite is transmitted between hosts.

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Question 3

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In year 1, a female tick lays eggs that hatch into larvae. The tick larvae parasitize a rodent that is infected with Borrelia burgdorferi. (Mice are a reservoir species.) The tick larvae become a vector of B. burgdorferi and molt into tick nymphs that overwinter in leaf litter. In year 2, the infected tick nymphs parasitize various animals (e.g., birds and humans). At this stage, humans and other tick hosts can be infected with B. burgdorferi and get Lyme disease. When the tick nymphs fall off and molt into adult ticks, they parasitize deer. While on the deer, adult ticks mate and adult females fall off and lay eggs to start the cycle again.

Chimpanzees infected with intestinal worms sometimes eat Aspilia leaves. This is an example of

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Question 4

Which of the following in NOT an example of an ectoparasite?

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Question 5

Crop rust is a _____ disease.

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Question 6

Question: Anthropologists studying a tribe on an island in the South Pacific ask you to help them with an intriguing health problem: the chiefs of the tribe keep dying at a much more rapid rate than other members of the population. You travel to the island to observe the tribe, and you find that each time an animal is killed during a hunt, the body of the animal is shared communally among all of the members of the tribe. However, one part of the animal, its brain, is reserved exclusively for the tribal chief. The chief consumes the brain raw because it is believed that this allows him to assimilate the animal's knowledge of the island. What would you suggest is causing the death of the tribal chiefs, how is it killing them, and what is the mechanism of transmission?

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Question 7

The ability of a host to prevent infection by parasites is called

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Question 8

The parasitic worm Acanthocephalus dirus has evolved an adaptation that causes its isopod host, Caecidotea intermedius, to

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Question 9

Researchers set up an experiment in which they treat plants with a new fertilizer and compare plant height after 2 months to a control (untreated) group of plants. Using the data that follow, perform a t-test (α = 0.05) to determine whether the fertilizer affected plant height in this experiment. Use this formula:

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Question 10

How do reservoir populations allow parasites to persist in nature?

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Question 11

In S-I-R models, if the ratio of new infections to recoveries is less than 1,

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Question 12

According to an S-I-R model, if a pathogen can kill its host

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Question 13

Which of the following strategies do schistosomes use to circumvent the host's immune system?

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Question 14

The growth rates of two plant species are 5.3 millimetres per year for plant A and 4.6 millimetres per year for plant B. The t-statistic is calculated as 1.12, and the critical t for an alpha of 0.05 with 18 degrees of freedom is 1.734. What is concluded about the growth rates of the species?

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Question 15

Dutch elm disease is caused by

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Question 16

In S-I-R models, if R₀ > 1,

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Question 17

The bacterium that causes chlamydia in humans can be transmitted from mother to fetus by _ transmission or between any two individuals by _ transmission.

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Question 18

Which of the following is NOT a characteristic of an emerging infectious disease?

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Question 19

Which characterizes the rate of infection between susceptible and infected individuals in an S-I-R model?

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Question 20

Showing 1 - 20 of 61

(Figure 15.11) The graph shows survival rates for North American populations of the little brown bat (Myotis lucifugus) after exposure to either a North American or European strain of white-nose fungus (Geomyces destructans). What did researchers conclude about the two strains?

The prion that causes bovine spongiform encephalopathy is _ transmitted _.

Describe the 2-year cycle of Lyme disease, including all hosts and how the parasite is transmitted between hosts.

Chimpanzees infected with intestinal worms sometimes eat Aspilia leaves. This is an example of

Which of the following in NOT an example of an ectoparasite?

Crop rust is a _____ disease.

The ability of a host to prevent infection by parasites is called

The parasitic worm Acanthocephalus dirus has evolved an adaptation that causes its isopod host, Caecidotea intermedius, to

How do reservoir populations allow parasites to persist in nature?

In S-I-R models, if the ratio of new infections to recoveries is less than 1,

According to an S-I-R model, if a pathogen can kill its host

Which of the following strategies do schistosomes use to circumvent the host's immune system?

The growth rates of two plant species are 5.3 millimetres per year for plant A and 4.6 millimetres per year for plant B. The t-statistic is calculated as 1.12, and the critical t for an alpha of 0.05 with 18 degrees of freedom is 1.734. What is concluded about the growth rates of the species?

Dutch elm disease is caused by

In S-I-R models, if R₀ > 1,

The bacterium that causes chlamydia in humans can be transmitted from mother to fetus by _ transmission or between any two individuals by _ transmission.

Which of the following is NOT a characteristic of an emerging infectious disease?

Which characterizes the rate of infection between susceptible and infected individuals in an S-I-R model?

Introduction: Ecology, Evolution, and the Scientific Method

Adaptations to Aquatic Environments

Adaptations to Terrestrial Environments

Adaptations to Variable Environments

Climates and Soils

Terrestrial and Aquatic Biomes

Evolution and Adaptation

Life Histories

Reproductive Strategies

Social Behaviours

Population Distributions

Population Growth and Regulation

Population Dynamics Over Space and Time

Predation and Herbivory

Competition

Community Structure

Community Succession

Movement of Energy in Ecosystems

Movement of Elements in Ecosystems

Landscape Ecology, Biogeography, and Global Biodiversity

Global Conservation of Biodiversity

Filters

Exam 15: Parasitism and Infectious Diseases

(Figure 15.11) The graph shows survival rates for North American populations of the little brown bat (Myotis lucifugus) after exposure to either a North American or European strain of white-nose fungus (Geomyces destructans). What did researchers conclude about the two strains?

The prion that causes bovine spongiform encephalopathy is _____ transmitted _____.

Describe the 2-year cycle of Lyme disease, including all hosts and how the parasite is transmitted between hosts.

Chimpanzees infected with intestinal worms sometimes eat Aspilia leaves. This is an example of

Which of the following in NOT an example of an ectoparasite?

Crop rust is a _____ disease.

The ability of a host to prevent infection by parasites is called

The parasitic worm Acanthocephalus dirus has evolved an adaptation that causes its isopod host, Caecidotea intermedius, to

How do reservoir populations allow parasites to persist in nature?

In S-I-R models, if the ratio of new infections to recoveries is less than 1,

According to an S-I-R model, if a pathogen can kill its host

Which of the following strategies do schistosomes use to circumvent the host's immune system?

The growth rates of two plant species are 5.3 millimetres per year for plant A and 4.6 millimetres per year for plant B. The t-statistic is calculated as 1.12, and the critical t for an alpha of 0.05 with 18 degrees of freedom is 1.734. What is concluded about the growth rates of the species?

Dutch elm disease is caused by

In S-I-R models, if R0 > 1,

The bacterium that causes chlamydia in humans can be transmitted from mother to fetus by _____ transmission or between any two individuals by _____ transmission.

Which of the following is NOT a characteristic of an emerging infectious disease?

Which characterizes the rate of infection between susceptible and infected individuals in an S-I-R model?

Introduction: Ecology, Evolution, and the Scientific Method

Adaptations to Aquatic Environments

Adaptations to Terrestrial Environments

Adaptations to Variable Environments

Climates and Soils

Terrestrial and Aquatic Biomes

Evolution and Adaptation

Life Histories

Reproductive Strategies

Social Behaviours

Population Distributions

Population Growth and Regulation

Population Dynamics Over Space and Time

Predation and Herbivory

Competition

Community Structure

Community Succession

Movement of Energy in Ecosystems

Movement of Elements in Ecosystems

Landscape Ecology, Biogeography, and Global Biodiversity

Global Conservation of Biodiversity

Filters

The prion that causes bovine spongiform encephalopathy is _ transmitted _.

In S-I-R models, if R₀ > 1,

The bacterium that causes chlamydia in humans can be transmitted from mother to fetus by _ transmission or between any two individuals by _ transmission.