MICROBIO LAB EXP 7 MIDTERM Flashcards
What is the ova of Ascaris spp. characterized by?
Oval shape with a thick, albuminous outer layer.
Describe the ova of Enterobius vermicularis.
Oval with a flattened side, typically containing a single cell.
What does the ova of Necator americanus look like?
Elliptical and thin-walled, with a clear space inside.
How can you identify the ova of Trichuris trichura?
Football-shaped with polar plugs at each end.
Describe the tissue sections of Trichinella spiralis.
Encysted larvae within muscle tissue.
What are the identifying features of adult Wuchereria bancrofti?
Long, slender, white worms; can be seen in lymphatic vessels.
What does the ova of Diphyllobothrium latum look like?
Operculated, oval, and large with a yellowish color.
How do you differentiate between the ova of Taenia saginata and Taenia solium?
Taenia saginata has a larger oval shape; Taenia solium has a more rounded shape.
What are the features of the scolex and proglottids of Taenia solium?
Scolex has hooks and suckers; proglottids are segmented.
Identify the adult Echinococcus granulosus.
Small, with a scolex and 3-4 proglottids.
Describe the ova of Clonorchis sinensis.
Oval with a distinct operculum.
What does the ova of Fasciola hepatica look like?
Large, oval-shaped with a distinct operculum.
How can you identify the ova of Schistosoma species?
Distinctive spine on one side; varies by species.
What are miracidia, rediae, and cercaria of Schistosoma?
Larval stages; miracidia are ciliated, rediae are elongated, cercaria are free-swimming.
Describe adult Clonorchis sinensis.
Leaf-shaped, flat, and has two suckers.
Identify the adult female and male Schistosoma japonicum.
Females are shorter and live in the male’s groove; males are larger.
What are the distinguishing features of Plasmodium species?
Ring forms in red blood cells; varying stages of development.
How do you recognize trypanosomes in stained blood smears?
Long, slender bodies with undulating membranes.
Identify Entamoeba histolytica in iron-hematoxylin stained fecal smears.
Trophozoites with ingested red blood cells.
What does Giardia lamblia look like in iron-hematoxylin stained fecal smears?
Pear-shaped trophozoites with two nuclei.
Identify Trichomonas vaginalis in a Papanicolaou-stained smear.
Pear-shaped with a flagellated margin.
What are the characteristics of Toxoplasma gondii in tissue sections?
Small, crescent-shaped organisms within cells.
Describe adult Pediculus humanus capitis.
Small, grayish-white, wingless insect with a flattened body.
How do you identify P. humanus eggs on a hair shaft?
Tiny, oval, and white, firmly attached to hair.
