11. Once introduced into the host (animal or man) the parasite becomes a(n) anti

Question

11. Once introduced into the host (animal or man) the parasite becomes a(n) antibody B) antigen C) antigen-antibody complex D) toxin E) none of the above-identify 12. Which of the following is the best transport preservative for protozoan or flagellated trophotozoites? A) zinc sulfate B) formal and ethyl acetate C) polyvinyl alcohol E) either of the above E) none of the above identify 13. Associated with the immune response, Charcot-Leyden crystals, which are believed to be the breakdown products of eosinophils, are characteristically suggestive of infection with A) presence of macronucleus and micronucleus in cysts or trophozoites - Balantidium coli B) centrally located karyosome in cysts or trophozoites - Entamoeba histolytica C) intracellular deposits within red blood cells Plasmodium species D) undulating membrane Trichomonas species E) presence of auxostyle and flagella - Giardia lamblia 14. Vaginal discharge in females, often latent in males, but there may be prostate involvement. These characteristically may be best associated with a(n) A) a coccidial protozoan- Balantidium coli B) a coccidial protozoan- Chilomastix mesnil C) flagellated protoan Trichomonas species D) a hemflagellated protozoan- Trypanosoma rangeli E) none of the above - identify 15. The Trichrome stain is best used to identify A) blood protozoa B) helminth eggs in feces C) tissue parasites D) all of the above E) none of the above identify 16. Parasites A) cause damage to crops of agricultural importance thereby affecting food productivity. B) cause damage to crops of economic importance thereby affecting technology and industrial productivity C) significantly affect morbidity and mortality among humans and animals D) all of the above 17. Although at the present time, most tests are nonspecific, elevation of IgM, IgG and IgA antibodies in response to many parasitic infections is known as a response. A) humoral B) cell-mediated C) passive D) all of the above E) none of the above 18. Correct identification of the parasite A) is required for proper treatment B) to I effects to the host D) all of the above

Explanation / Answer

Answer: B an D (antigen and toxin)

Once parasites are introduced in the animals/humans they are recognised as foreign and act as antigen and immune response is elicited against them. However, some bacteria produce toxins like cholera toxins for their adaptibility.

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