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Entamoeba cells are small, with a single nucleus and typically a single lobose pseudopod taking the form of a clear anterior bulge. They have a simple life cycle. The trophozoite (feeding-dividing form) is approximately 10-20 μm in diameter and feeds primarily on bacteria. It divides by simple binary fission to form two smaller daughter cells.
- Entamoeba, Casagrandi & Barbagallo, 1897
- Entamoebidae
Introduction. Entamoeba histolytica, the enteric parasite, has a simple two-stage life cycle. It can exist as the motile, unicellular tropho-zoite in the human intestine or as the dormant quadri-nucleate cyst in the external environment. The trophozoite ranges in size from 20–40 μm.
- Anuradha Lohia
- 2003
The cell nucleus, which is distinctive for the genus, contains a central body, the endosome, and a ring of uniformly sized granules attached to the nuclear membrane. Primary infection of the large intestine with E. histolytica (amebiasis) is often asymptomatic; however, diarrhea, abdominal pain, and fever may result from invasion and ulceration ...
- The Editors of Encyclopaedia Britannica
Its body is covered by plasma lemma and cytoplasm is differentiated into ectoplasm and endoplasm. There is a single large, broad and blunt pseudopodium formed of ectoplasm. Endoplasm contains single spherical nucleus and food vacuoles. Nucleus has peripheral crown of chromatin blocks and a centrally located nucleolus.
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This parasite has one large nucleus with a thick membrane surrounding the nucleus. There are many chromatin inside the nucleus, and one large, irregular-shaped karyosome. [8] . The chromatin is clumped, and uneven in disperse inside the nucleus.
- E. coli
- Entamoeba
Apr 16, 2024 · Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes.
Mature Entamoeba histolytica/Entamoeba dispar cysts have 4 nuclei that characteristically have centrally-located karyosomes and fine, uniformly distributed peripheral chromatin. Cysts usually measure 12 to 15 µm.
