Search results
Results From The WOW.Com Content Network
Clockwise from top right: Amoeba proteus, Actinophrys sol, Acanthamoeba sp., Nuclearia thermophila., Euglypha acanthophora, neutrophil ingesting bacteria. An amoeba (/ ə ˈ m iː b ə /; less commonly spelled ameba or amœba; pl.: amoebas (less commonly, amebas) or amoebae (amebae) / ə ˈ m iː b i /), [1] often called an amoeboid, is a type of cell or unicellular organism with the ability ...
Another hypothesis is that a primitive cell underwent nucleus division, thereby becoming a coenocyte. A membrane would then form around each nucleus (and the cellular space and organelles occupied in the space), thereby resulting in a group of connected cells in one organism (this mechanism is observable in Drosophila). A third hypothesis is ...
However, flagella do occur among the Archamoebae, and many slime moulds produce biflagellate gametes [citation needed]. The flagellum is generally anchored by a cone of microtubules, suggesting a close relationship to the opisthokonts. [citation needed] The mitochondria in amoebozoan cells characteristically have branching tubular cristae.
Amoeba proteus in locomotion. Historically, researchers have divided the cytoplasm into two parts, consisting of a granular inner endoplasm and an outer layer of clear ectoplasm, both enclosed within a flexible plasma membrane. [13] The cell usually has a single granular nucleus, containing most of the organism's DNA.
Eukaryotes have a nucleus in their cells, and include: Protists – many unicellular eukaryotes including malarial parasites, amoeba, and diatoms. [69] Kingdom Fungi – eukaryotes such as mushroom, yeast, and mould; all fungi. Kingdom Plantae – all plants. Kingdom Animalia – all animals.
The cell on the left is going through mitosis and its chromosomes have condensed. Cell nucleus: A cell's information center, the cell nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell's chromosomes, and is the place where almost all DNA replication and RNA synthesis (transcription) occur.
An anucleated cell contains no nucleus and is, therefore, incapable of dividing to produce daughter cells. The best-known anucleated cell is the mammalian red blood cell, or erythrocyte , which also lacks other organelles such as mitochondria, and serves primarily as a transport vessel to ferry oxygen from the lungs to the body's tissues.
Chaos is a genus of single-celled amoeboid organisms in the family Amoebidae.The largest and most-known species, the so-called "giant amoeba" (Chaos carolinensis), can reach lengths up to 5 mm, although most specimens fall between 1 and 3 mm. [3] [4] [5]