Question 1

Which of the following would be most likely to stop transmission of Plasmodium falciparum and P.vivax to humans?

Accepted Answer

Providing mosquito netting for beds is the most effective way to prevent transmission of Plasmodium falciparum and P.vivax, as they are transmitted through the bite of infected female Anopheles mosquitoes. Ensuring access to clean drinking water, checking for ticks after walking in wooded areas, and eliminating bedbugs from sleeping quarters do not address the specific mode of transmission of these parasites.

Question 2

Why is perianal itching significant in the life cycle of pinworms?

Accepted Answer

Perianal itching can lead to the trapping of pinworm eggs under fingernails, which can then be transferred to new hosts and continue the life cycle of the pinworms.

Question 3

What is the function of the process shown in the life cycle of Entamoeba histolytica?

Accepted Answer

The answer of What is the function of the process...

Question 4

Which of the following is a characteristic shared by mites,ticks,and lice?

Accepted Answer

Mites, ticks, and lice are all ectoparasites, meaning they live on the outside of their hosts' bodies. They do not deposit eggs within the skin, and ticks are not classified as insects. While some species of mites, ticks, and lice can transmit disease agents, not all of them do, so B is not a characteristic shared by all three.

Question 5

Blood and fecal samples are collected from a man with dysentery to determine the causative agent and appropriate treatment.Which of the following would most clearly indicate amebic infection?

Accepted Answer

The presence of a protozoa with ingested red blood cells is characteristic of amebic infection, which is commonly caused by Entamoeba histolytica. Immunological tests would detect certain antibodies or antigens associated with specific pathogens, but would not necessarily indicate amebic infection. Gram staining and endospore staining are used to identify bacteria, which may or may not be the causative agent of dysentery.

Question 6

On a trip to a region of Asia where snails commonly ingest trematode eggs,Rebecca refuses to eat escargot,cooked snails,offered by her roommate.Instead,Rebecca goes fishing because she feels it would be safer to eat fresh fish.Unfortunately,she undercooks the fish and develops a trematode infection.What is the most likely explanation for her infection?

Accepted Answer

In the region of Asia where snails commonly ingest trematode eggs, it is likely that the water in which the fish lives is contaminated with free-swimming trematode larvae released by infected snails. These larvae can then penetrate the tissues of the fish and develop into a secondary form. If the fish is not cooked thoroughly, these trematodes can infect humans who consume the undercooked fish. Rebecca's infection is most likely due to the ingestion of these trematode larvae in the undercooked fish she ate.

Question 7

The image shown indicates two paramecia of opposite mating types during one stage of conjugation in which haploid micronuclei are exchanged.Which of the following statements accurately describes the two cells after this stage is complete?

Accepted Answer

The answer of The image shown indicates two paramecia of...

Question 8

On an evolutionary timeline,which of the following organisms appeared last?

Accepted Answer

Plants evolved from algae, so they appeared after all three types of algae (cyanobacteria, proto-algae, and algae).

Question 9

What is the function of the apical complex on a merozoite form of Plasmodium falciparum?

Accepted Answer

The apical complex is a specialized structure found on the surface of certain protozoans, including Plasmodium falciparum. It consists of several proteins and is used by the parasite to penetrate host cells, such as red blood cells, during the infection cycle. Therefore, the correct answer is B) The apical complex is used to allow a merozoite to enter a red blood cell.

Question 10

Amoeba proteus,a lobed ameba,most likely moves by using

Accepted Answer

Amoeba proteus moves by cytoplasmic streaming, which is the movement of the cytoplasm in a specific direction to propel the organism forward. It does not have flagella, cilia, or needlelike pseudopods.

Question 11

Filamentous amebas

Accepted Answer

The answer of Filamentous amebas
...

Question 12

The organism shown in this figure is a(n)

Accepted Answer

The answer of The organism shown in this figure is...

Question 13

The organism shown is designed for living

Accepted Answer

The organism is shown attached to the outer surface of the body, indicating that it is designed for living on the outer surface of the body.

Question 14

Giardia lamblia and Trichomonas vaginalis are both metamonads.One similarity between the two species is

Accepted Answer

Both Giardia lamblia and Trichomonas vaginalis are flagellated metamonads, meaning they both have one or more flagella for motility. Cysts are a characteristic of Giardia, but not Trichomonas. Crossing the placenta is not relevant to these two species.

Question 15

In the illustrated life cycle of the trypanosome,which of the following forms proliferates within the definitive host?

Accepted Answer

The answer of In the illustrated life cycle of the...

Question 16

A free-living soil ameba may contaminate contact lens solutions and cause amebic keratitis.What is the genus name of one common causative agent of amebic keratitis?

Accepted Answer

Acanthamoeba is a common causative agent of amebic keratitis, which can contaminate contact lens solutions.

Question 17

Which of the following organisms lacks the ability to use aerobic cellular respiration?

Accepted Answer

Giardia lamblia lacks the necessary organelles (mitochondria) to perform aerobic cellular respiration. Instead, it obtains energy through fermentation. The other organisms listed have the ability to perform aerobic cellular respiration.

Question 18

In the illustrated life cycle of the trypanosome,which of the following forms is nondividing?

Accepted Answer

The stumpy form is nondividing, whereas the slender, procyclic, and epimastigote forms are dividing.

Question 19

Trypanosoma brucei,the parasite that causes African sleeping sickness,is carried by

Accepted Answer

Trypanosoma brucei is carried by tsetse flies, which are found in sub-Saharan Africa.

Question 20

Which of the following is unique to ciliates?

Accepted Answer

Ciliates are unique in maintaining two different types of nuclei - a micronucleus and a macronucleus. The micronucleus is involved in sexual reproduction while the macronucleus is responsible for everyday cellular functions. Although ciliates do possess cilia, other organisms such as paramecium also possess cilia. Endocytosis is a general cellular process and microtubules are present in various types of cells.

Quiz 11: Eukaryotic Microbes and Invertebrate Infectious Agents