Parasitology Quiz Questions And Answers

The correct answer is RBCs. When the trophozoite is invasive in tissue, it may contain ingested red blood cells (RBCs) in its cytoplasm. This can occur during the process of phagocytosis, where the trophozoite engulfs and digests RBCs for nutrients. This behavior is commonly observed in certain parasitic protozoa, such as the Plasmodium species that cause malaria.

Entamoeba hartmanni is a non-pathogenic species of amoeba that resides in the human intestines. It does not cause any disease or harm to the host. Therefore, the statement that Entamoeba hartmanni is pathogenic is false.

Trophozoites of Entamoeba Hartmanni do not ingest RBCs. Instead, they primarily feed on bacteria and other microorganisms present in the intestine.

Entamoeba gingivalis is the correct answer because it is the only option that matches the description given in the question. The question states that this parasite is found in the soft tartar between the teeth and recovered from the tonsillar crypts, and its trophozoites measure 5-15 um. Entamoeba gingivalis is known to inhabit the oral cavity and is commonly found in dental plaque and periodontal pockets. Its trophozoites are indeed in the size range mentioned. Therefore, based on the information provided, Entamoeba gingivalis is the most suitable answer.

As the cyst of Entamoeba Histolytica matures, it contains more nuclei. The correct answer, 1-4, indicates that the cyst can have a range of 1 to 4 nuclei. This suggests that as the cyst develops further, it may contain more nuclei, but it will never exceed 4.

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E.coli is a type of bacteria that is commonly found in the intestines of humans and animals. While some strains of E.coli can cause illness, not all strains are pathogenic. In fact, many strains of E.coli are harmless and considered commensal, meaning they coexist with their host without causing harm. Therefore, the statement that E.coli is a pathogenic commensal organism is false.

Trophozoites of Entamoeba Histolytica are 10-20 um in size.

Entamoeba Histolytica cysts are also 10-20 um in size and are round.

The cysts of Entamoeba Hartmanni differ from E. histolytica because frequently the cysts contain only 1 or 2 nuclei even though the mature cyst contains 4 nuclei.

Endolimax Nana is a type of parasite that infects the human intestines. It is not identified on a temporary stain due to its small size. Instead, it is identified through a process called direct wet mount microscopy, where a sample is observed under a microscope without any staining. Therefore, the given statement is false.

Entamoeba gingivalis is the correct answer because it is the only species of Entamoeba that is known to ingest white blood cells (WBCs). This protozoan parasite is commonly found in the oral cavity and can cause periodontal disease. It is able to phagocytose and feed on WBCs, which contributes to its pathogenicity in the oral environment. Other species of Entamoeba, such as Entamoeba coli, Entamoeba polecki, Entamoeba hartmanni, and Entamoeba histolytica, do not have this ability.

This organism is identified by seeing one nucleus in mature cysts; rarely 2 or 4 also seen. The correct answer is Entamoeba Polecki.

The correct answer is 5-10. This range indicates the size of cysts for the parasite Entamoeba Hartmanni. The size of the cysts can vary within this range, with the smallest being 5 micrometers and the largest being 10 micrometers.

The correct answer is 4-12. This is because trophozoites from Entamoeba Hartmani can vary in size and can be as small as 4 micrometers or as large as 12 micrometers.