The nematode Enterobius vermicularis is commonly known as __________.

Are all nematodes parasitic?

. Enterobius vermicularis infection is usuallydiagnosed by findingA. Eggs in perianal specimensB. Larvae in a stool specimenC. Adults in fecesD. Eggs in the feces2. Which organism infects humans by larvalpenetration?A. Enterobius vermicularisB. Ascaris lumbricoidesC. Necator americanusD. Trichuris trichiura3. Which statement is correct for specimencollection and processing?A. Stool samples can contain urine.B. Stools can be frozen without affectingparasitic structure.C. Liquid stools are best for detectingameba and flagellate trophozoites.D. Unpreserved stools can remain at roomtemperature for up to 72 hours.4. For which organism is the trophozoite theinfective stage for humans?A. Endolimax nanaB. Dientamoeba fragilisC. Entamoeba coliD. Giardia duodenalis5. The primary diagnostic specimen for de-tecting infection with Naegleria fowleri is a:A. Thick blood smearB. Corneal scrapingC. Cerebrospinal fluid sedimentD. Skin biopsy6. The host in which sexual reproductiontakes place is called theA. CommensalB. Definitive hostC. Intermediate hostD. Vector

Nematocysts are harpoon-like structures in Cnidarians that are coiled up inside ectoderm cells and are shot out using water pressure to sting other organisms.Question 4Select one:TrueFalse

Which of the following is NOT an enteric?Group of answer choicesSalmonellaShigellaEnterobacterEscherichiaCampylobacter

Which of the following has a gastrovascular cavity?a) Earthwormb) Flatwormc) Nematode wormd) Round worm