Exam 13: Parasitism

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?

Humans have a long history of association with canines, which has led to the emergence of domestic dogs. Humans currently associate with dogs in different ways than they did historically. What type of relationship would a lap dog such as a Shih Tzu or a Chihuahua have with its owner? Could this relationship be considered parasitic?

Which of the following could not be a hemiparasite?

The most likely change caused by Vibrio cholerae in its hosts, which aids its dispersal to new hosts, is

Which parasite would most likely be found in the human small intestine?

In which way can a parasite change an ecological community?

What is the advantage for a male cricket parasitized by hairworms to seek out water?

Which statement about parasitic fungi, such as mildews, rusts, and smuts, is false?

Which characteristic is an advantage that ectoparasites have over endoparasites?

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

Climate change is predicted to have wide-ranging effects on species interactions and ultimately ecological communities. Which statement if true?

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?

Two populations (population 1 and population 2) are suffering from disease outbreaks that spread rapidly (disease 1 and disease 2). Population 1 is only affected by disease 1 and population 2 is only affected by disease 2. The two populations are the same size and the same density. In population 1, disease 1 is sexually transmitted, and in population 2, disease 2 is transmitted by an insect vector. What major difference would you expect to see in the pattern of disease transmission between the two populations? How would you expect seasonality or mating strategy to affect the spread of the diseases? What methods could you use to control the spread of disease in each case?

As a budding scientist you discover a parasite associated with your favorite organism. To learn more about the parasite and the organism, you study them in depth, learning that the organism attacks the parasite using memory cells in an effort to prevent infection. Which type of mechanism is the organism utilizing as a defense against the parasite?

Suppose that a vertebrate has a mutation in the transferrin gene that makes the protein function less efficiently. Most likely, compared to individuals without the mutation, this individual would have _______ iron in its blood serum and _______ iron in the intercellular components of cells.

What do the fungus that causes athlete's foot, the tick that spreads Lyme disease, and body lice all have in common?

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

Based on the results of Dobson and Meagher's study of bison, which statement is false?

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 _______.

Which statement about tuberculosis (TB) is false?