Question 1

Refer to the figure.
 Which aphid genotype with the symbiont present had a survival percentage closest to 35?

Accepted Answer

The answer of Refer to the figure.
 Which aphid genotype...

Question 2

Mosquitoes infected with Plasmodium carry cells of the _______ stage of the parasite. When an infected mosquito bites a human, these cells enter the _______, where they divide into _______ that then infect red blood cells.

Accepted Answer

Mosquitoes infected with Plasmodium carry sporozoites, which enter the human liver, where they divide into merozoites that then infect red blood cells.

Question 3

Which statement about malaria and the life cycle of Plasmodium is false?

Accepted Answer

The gamete-producing cells, or gametocytes, arise from merozoites, not sporozoites. Sporozoites are the form that infects the liver cells initially.

Question 4

In humans, red blood cells that have been infected with the parasite that causes malaria (Plasmodium) are destroyed mainly in the

Accepted Answer

The spleen is responsible for filtering and removing damaged or infected red blood cells, including those infected by the malaria parasite.

Question 5

In the years since Myxoma was introduced to Australia, the virus has _______ and rabbits have _______ resistance to the virus.

Accepted Answer

The Myxoma virus evolved to become less lethal over time, and rabbits evolved resistance to the virus, leading to a co-evolutionary process.

Question 6

The studies by Dybdahl and Lively on snails and their parasites demonstrated that

Accepted Answer

The studies showed that parasites are more successful at infecting common genotypes of snails, which supports the Red Queen hypothesis where hosts and parasites co-evolve, with parasites adapting to the most common host genotypes.

Question 7

Which statement about the snail-trematode system studied by Dybdahl and Lively is false?

Accepted Answer

Dybdahl and Lively found that parasites were more effective at infecting snails from their home lake, not less.

Question 8

Refer to the figure.
 A population of rabbits has a mortality rate of 40%. The population would be hypothesized to have experienced _______ epidemics.

Accepted Answer

The answer of Refer to the figure.
 A population of...

Question 9

Refer to the figure.
 While sampling lakes in New Zealand for the number of snails infected with the Microphallus parasite, you get lost and aren't sure which lake you're sampling from. After returning to the lab, you identify the snails as Lake Paringa snails and determine the percentage of snails infected to be ~10%. Which lake did you most likely collect the snails from?

Accepted Answer

The answer of Refer to the figure.
 While sampling lakes...

Question 10

Which of the following is most likely to prevent or stop an arms race between host and parasite?

Accepted Answer

A trade-off between a host's survival when parasitized and its reproductive success in the absence of parasitism can prevent an arms race by balancing the costs and benefits of resistance, thus stabilizing the evolutionary dynamics.

Question 11

Kraaijeveld and colleagues performed studies with Drosophila strains that can mount an encapsulation defense. In the absence of encapsulation, wasp eggs that have the ability to avoid encapsulation hatch _______ other eggs that cannot avoid encapsulation. These studies demonstrate _______.

Accepted Answer

The answer of Kraaijeveld and colleagues performed studies with Drosophila...

Question 12

The fungal parasite Cryphonectria parasitica is responsible for driving its host, the _______, to near extinction in North America.

Accepted Answer

Cryphonectria parasitica is the fungus responsible for chestnut blight, which devastated the American chestnut tree population in North America.

Question 13

Refer to the figure.
   The figure shows results from a study by Hudson and colleagues on red grouse and their nematode parasite. The figures show the cycling of six red grouse populations subjected to three treatments: (A) two control populations, (B) two populations treated for nematode parasites in 1989, and (C) two populations treated for parasites in 1989 and 1993. Each of the six grouse populations is designated by a different color. These results show that removal of the parasite

Accepted Answer

The answer of Refer to the figure.
   The...

Question 14

In the context of host-parasite dynamics, a latent period is the time

Accepted Answer

The latent period is the time between infection in a host and when the host can transmit the disease to others.

Question 15

In the simple host-pathogen model, which term describes the rate at which a disease is transmitted?

Accepted Answer

The answer of In the simple host-pathogen model, which term...

Question 16

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals also doubles, the threshold density should

Accepted Answer

The threshold density is determined by the ratio of the transmission rate to the combined death and recovery rate. If both the transmission rate and the combined death and recovery rate double, the ratio remains the same, so the threshold density stays the same.

Question 17

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals remains the same, the threshold density should

Accepted Answer

The answer of According to the basic host-pathogen model, if...

Question 18

In the simple host-pathogen model, which term describes the rate at which a susceptible individual encounters an infected individual?

Accepted Answer

In the simple host-pathogen model, the term "SI" represents the product of the number of susceptible individuals (S) and the number of infected individuals (I), which describes the rate at which susceptible individuals encounter infected individuals.

Question 19

Suppose that the relative proportion of susceptible and infected individuals in a population remains the same, but the density of the overall population doubles. According to the $\beta$SI model, disease transmission should

Accepted Answer

The answer of Suppose that the relative proportion of susceptible...

Question 20

The transmission coefficient of the hypothetical disease Dirks fever is 0.8. If the combined death and recovery rate is 0.4, what is the threshold density for Dirks fever?

Accepted Answer

The answer of The transmission coefficient of the hypothetical disease...

Quiz 13: Parasitism

Refer to the figure. Which aphid genotype with the symbiont present had a survival percentage closest to 35?

Mosquitoes infected with Plasmodium carry cells of the ___ stage of the parasite. When an infected mosquito bites a human, these cells enter the _, where they divide into _____ that then infect red blood cells.

Which statement about malaria and the life cycle of Plasmodium is false?

In humans, red blood cells that have been infected with the parasite that causes malaria (Plasmodium) are destroyed mainly in the

In the years since Myxoma was introduced to Australia, the virus has _ and rabbits have _ resistance to the virus.

The studies by Dybdahl and Lively on snails and their parasites demonstrated that

Which statement about the snail-trematode system studied by Dybdahl and Lively is false?

Refer to the figure. A population of rabbits has a mortality rate of 40%. The population would be hypothesized to have experienced _______ epidemics.

Which of the following is most likely to prevent or stop an arms race between host and parasite?

Kraaijeveld and colleagues performed studies with Drosophila strains that can mount an encapsulation defense. In the absence of encapsulation, wasp eggs that have the ability to avoid encapsulation hatch _ other eggs that cannot avoid encapsulation. These studies demonstrate _.

The fungal parasite Cryphonectria parasitica is responsible for driving its host, the _______, to near extinction in North America.

In the context of host-parasite dynamics, a latent period is the time

In the simple host-pathogen model, which term describes the rate at which a disease is transmitted?

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals also doubles, the threshold density should

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals remains the same, the threshold density should

In the simple host-pathogen model, which term describes the rate at which a susceptible individual encounters an infected individual?

Suppose that the relative proportion of susceptible and infected individuals in a population remains the same, but the density of the overall population doubles. According to the $\beta$ SI model, disease transmission should

The transmission coefficient of the hypothetical disease Dirks fever is 0.8. If the combined death and recovery rate is 0.4, what is the threshold density for Dirks fever?

Quiz 13: Parasitism

Refer to the figure. Which aphid genotype with the symbiont present had a survival percentage closest to 35?

Mosquitoes infected with Plasmodium carry cells of the _______ stage of the parasite. When an infected mosquito bites a human, these cells enter the _______, where they divide into _______ that then infect red blood cells.

Which statement about malaria and the life cycle of Plasmodium is false?

In humans, red blood cells that have been infected with the parasite that causes malaria (Plasmodium) are destroyed mainly in the

In the years since Myxoma was introduced to Australia, the virus has _______ and rabbits have _______ resistance to the virus.

The studies by Dybdahl and Lively on snails and their parasites demonstrated that

Which statement about the snail-trematode system studied by Dybdahl and Lively is false?

Refer to the figure. A population of rabbits has a mortality rate of 40%. The population would be hypothesized to have experienced _______ epidemics.

Which of the following is most likely to prevent or stop an arms race between host and parasite?

Kraaijeveld and colleagues performed studies with Drosophila strains that can mount an encapsulation defense. In the absence of encapsulation, wasp eggs that have the ability to avoid encapsulation hatch _______ other eggs that cannot avoid encapsulation. These studies demonstrate _______.

The fungal parasite Cryphonectria parasitica is responsible for driving its host, the _______, to near extinction in North America.

In the context of host-parasite dynamics, a latent period is the time

In the simple host-pathogen model, which term describes the rate at which a disease is transmitted?

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals also doubles, the threshold density should

According to the basic host-pathogen model, if the combined death and recovery rate from a disease doubles, and the effectiveness of the disease to spread from infected to uninfected individuals remains the same, the threshold density should

In the simple host-pathogen model, which term describes the rate at which a susceptible individual encounters an infected individual?

Suppose that the relative proportion of susceptible and infected individuals in a population remains the same, but the density of the overall population doubles. According to the β\betaβ SI model, disease transmission should

The transmission coefficient of the hypothetical disease Dirks fever is 0.8. If the combined death and recovery rate is 0.4, what is the threshold density for Dirks fever?

Mosquitoes infected with Plasmodium carry cells of the ___ stage of the parasite. When an infected mosquito bites a human, these cells enter the _, where they divide into _____ that then infect red blood cells.

In the years since Myxoma was introduced to Australia, the virus has _ and rabbits have _ resistance to the virus.

Kraaijeveld and colleagues performed studies with Drosophila strains that can mount an encapsulation defense. In the absence of encapsulation, wasp eggs that have the ability to avoid encapsulation hatch _ other eggs that cannot avoid encapsulation. These studies demonstrate _.

Suppose that the relative proportion of susceptible and infected individuals in a population remains the same, but the density of the overall population doubles. According to the $\beta$ SI model, disease transmission should