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Questions and Answers
Which of the following parasites is an endoparasite?
Which of the following parasites is an endoparasite?
- Screwworm
- Trichuris trichiura (correct)
- Crab louse
- Head louse
What is the characteristic feature of an ectoparasite?
What is the characteristic feature of an ectoparasite?
- They are microscopic in size
- They are oval and cemented at the base of the hair shaft near the scalp (correct)
- They live within the intestines of the host
- They are usually confused with dandruff
Which type of parasite is the crab louse?
Which type of parasite is the crab louse?
- Obligate parasite
- Ectoparasite (correct)
- Endoparasite
- Facultative parasite
Which parasite is known to cause intestinal infections?
Which parasite is known to cause intestinal infections?
What distinguishes nits from other structures in hair?
What distinguishes nits from other structures in hair?
Which of the following parasites can exist physiologically independently of another but may establish a relationship if the opportunity presents itself?
Which of the following parasites can exist physiologically independently of another but may establish a relationship if the opportunity presents itself?
Which parasite lives inside the host?
Which parasite lives inside the host?
Which parasite is an example of an ectoparasite?
Which parasite is an example of an ectoparasite?
Which type of parasite requires a specific host to survive?
Which type of parasite requires a specific host to survive?
Which parasite is considered an obligate symbiont?
Which parasite is considered an obligate symbiont?
Which of the following parasites is a facultative parasite?
Which of the following parasites is a facultative parasite?
What type of parasite is Strongyloides stercoralis?
What type of parasite is Strongyloides stercoralis?
How is neonatal toxoplasmosis typically acquired?
How is neonatal toxoplasmosis typically acquired?
Where does the hookworm larva typically penetrate to infect the host?
Where does the hookworm larva typically penetrate to infect the host?
What is the vector of Trypanosoma cruzi?
What is the vector of Trypanosoma cruzi?
Which stage of a protozoan is responsible for feeding, growing, and dividing?
Which stage of a protozoan is responsible for feeding, growing, and dividing?
What is the primary mode of transmission for Trichomonas vaginalis?
What is the primary mode of transmission for Trichomonas vaginalis?
What term is used to describe a symbiotic relationship where one organism benefits and the other is not harmed?
What term is used to describe a symbiotic relationship where one organism benefits and the other is not harmed?
Which term refers to a symbiotic relationship where one organism is carried by another without physiological dependence?
Which term refers to a symbiotic relationship where one organism is carried by another without physiological dependence?
What is the term for an organism that is physiologically dependent on establishing a symbiotic relationship with another?
What is the term for an organism that is physiologically dependent on establishing a symbiotic relationship with another?
Which parasite is an example of an obligate parasite that causes malaria?
Which parasite is an example of an obligate parasite that causes malaria?
In the context of symbiotic relationships, what is the term for the organism that carries another symbiont?
In the context of symbiotic relationships, what is the term for the organism that carries another symbiont?
Which term describes a symbiotic relationship where one organism benefits while the other is harmed?
Which term describes a symbiotic relationship where one organism benefits while the other is harmed?
Which parasite can live on the exterior of the host?
Which parasite can live on the exterior of the host?
Which parasite can establish a relationship if the opportunity presents itself?
Which parasite can establish a relationship if the opportunity presents itself?
Which parasite is an endoparasite that can infect the liver?
Which parasite is an endoparasite that can infect the liver?
Which parasite is known to cause infections in humans and several other hosts?
Which parasite is known to cause infections in humans and several other hosts?
Which parasite is considered an obligate symbiont?
Which parasite is considered an obligate symbiont?
Which parasite is a facultative symbiont found in cerebrospinal fluid?
Which parasite is a facultative symbiont found in cerebrospinal fluid?
Which phylum includes organisms characterized by typically having two types of nuclei?
Which phylum includes organisms characterized by typically having two types of nuclei?
Which parasite is transmitted via spores and can cause symptoms such as diarrhea and neurological issues in AIDS patients?
Which parasite is transmitted via spores and can cause symptoms such as diarrhea and neurological issues in AIDS patients?
Which class within the subphylum Sarcomastigophora houses parasites that are tissue parasites with alternating sexual and asexual cycles?
Which class within the subphylum Sarcomastigophora houses parasites that are tissue parasites with alternating sexual and asexual cycles?
Which organism is typified by the trophozoite shown in the image?
Which organism is typified by the trophozoite shown in the image?
Which parasite causes malaria and has four species known to be responsible for the disease?
Which parasite causes malaria and has four species known to be responsible for the disease?
Which phylum includes tapeworms and flukes, with tapeworms often present in vital organs?
Which phylum includes tapeworms and flukes, with tapeworms often present in vital organs?
What term is used to describe a new infection with the same species of parasite?
What term is used to describe a new infection with the same species of parasite?
How is Strongyloides stercoralis specifically related to autoinfection?
How is Strongyloides stercoralis specifically related to autoinfection?
Which of the following is NOT a source of exposure to parasitic infection according to the text?
Which of the following is NOT a source of exposure to parasitic infection according to the text?
What is the portal of entry for neonatal toxoplasmosis via congenital transmission?
What is the portal of entry for neonatal toxoplasmosis via congenital transmission?
Which parasite stage is responsible for the feeding, growing, and dividing activities of a protozoan?
Which parasite stage is responsible for the feeding, growing, and dividing activities of a protozoan?
Which option correctly matches the parasites with their mode of entry?
Which option correctly matches the parasites with their mode of entry?
Which parasitic infection involves nits that take about 1 week to hatch and are usually located within 6 mm of the scalp?
Which parasitic infection involves nits that take about 1 week to hatch and are usually located within 6 mm of the scalp?
Which parasite forms microfilaria in the blood and is considered a tissue nematode?
Which parasite forms microfilaria in the blood and is considered a tissue nematode?
What is the characteristic size of adult crab louse found on hair?
What is the characteristic size of adult crab louse found on hair?
Which parasites are typically cemented at the base of the hair shaft nearest the scalp and often confused for dandruff or hair spray droplets?
Which parasites are typically cemented at the base of the hair shaft nearest the scalp and often confused for dandruff or hair spray droplets?
Which parasite causes a condition known as Screwworm infection on the scalp?
Which parasite causes a condition known as Screwworm infection on the scalp?
Study Notes
Phylum: Platyhelminthes
- Hermaphroditic flatworms
- Cestoidea: tapeworms, stages often in vital organs
- Trematoda: flukes (Schistosomes)
Phylum: Nematoda
- Round worms, dioecious
- Intestines: Ascaris, Trichuris, Strongyloides
- Blood: Wuchereria bancrofti, Onchocerca volvulus
- Tissue: Dracunculus
Phylum: Arthropoda
- Insects and their ilk
- Important ectoparasites
- Vectors of disease
- Examples: screwworm infection, crab louse, head louse
Symbiotic Relationships
- Commensalism: one host benefits, other not harmed
- Phoresy: symbiont carried by host
- Parasitism: one symbiont benefits, other harmed
- Obligate parasite: physiologically dependent on host
- Facultative parasite: can exist independently, may establish relationship
Parasite/Host Relationships
- Very specific: humans only, e.g. Taenia solium, Trichuris trichiura
- Less specific: humans and several other hosts, e.g. Strongyloides stercoralis, Trypanosoma cruzi
- Not specific: range of mammals, e.g. smallpox, malaria, Trichuriasis
Sources of Exposure to Parasitic Infection
- Contaminated food or water
- Food with the infective stage
- Blood sucking/biting arthropod
- Close contact with infected person
- Oneself (autoinfection)
Portals of Entry
- Mouth
- Skin
- Inhalation
- Transplacental
- Sexual intercourse
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Description
This quiz covers the classification and characteristics of parasitic organisms found in the Trematoda, Nematoda, and Arthropoda phyla. It includes information on flukes like Fasciola hepatica, roundworms such as Ascaris and Trichuris, as well as important parasites like Wuchereria bancrofti and Onchocerca volvulus.
