MIP 260 Exam 2 question n answers graded A+ 2023/2024

MIP 260 Exam 2 Amoeba types: (mentioned in class) - correct answer 1)Entameobidae -Entamoeba gingivalis -Entamoeba nana -Iodamoeba buetshii 2)Vahlkampfiidae -Naegleria fowleri -acanthamoeba 3)Acanthamoebidae -acanthamoeba Entamoeba gingivalis - correct answer First to be described in humans (also dogs,cats,primates); ubiquitous; commensal on teeth and gums and in gingival pockets and tonsils as well as dentures Entamoeba gingivalis (form and structure) - correct answer only trophozoites (feeding stage), no cyst form quick movements (pseudopodia) 10x20 microns diameter numerous food vacuoles w/ cellular debris,bacteria,blood cells (present in 95% unhealthy mouth, 50% healthy mouth) Endolimax nana - correct answer Vertabrates and Invertabrates; non pathogenic; indicative of poor conditions; encyst; short blunt pseupodia; In large intestine, feeds on bacteria; moves very slowly Endolimax nana form and structure - correct answer trophozoites 6-15 microns small vesicular nucleus large glycogen and food vacuoles precyst secretes cyst wall; mature cyst has 4 nuclei Entamoeba spp life cycle - correct answer 1) cysts and trophozoites passed in feces of human (INFECTIVE AND DIAGNOSTIC STAGE) 2)mature cysts are digested (INFECTIVE AND DIAGNOSTIC STAGE) 3) Excystation- parasites leave cyst and enter large intestine for non-invasive colonization (endolimax nana remain near cecum in large intestine to feed on bacteria) Iodamoeba butschlii - correct answer Humans, primates; most common in pigs; large intestine- feeds on GI flora Iodamoeba butschlii - correct answer 9-14 microns both cyst and trophozoite form; moves slowly; mature cyst has 1 large vesicular nucleus and is infective ** 5-min review: What characteristics distinguish the various species of Entamoeba spp? - correct answer on notebook Opportunistic amoeba - correct answer can wreak havoc in humans usually free-living but can invade host tissues Vahlkampfiidae - correct answer in very contaminated water (aerobic inhabitants)