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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.
Apr 29, 2024 · The oral cavity is a habitat to a diverse range of organisms that make up an essential element of the human microbiota. There are up to 1000 species of micro-organisms capable of colonizing the mouth. Thirty percent of them are uncultivable. The genus Entamoeba includes several species, out of which at least seven of them are able to inhabit the human body (Entamoeba histolytica, Entamoeba ...
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Apr 29, 2024 · The results showed that the increase in prevalence of E. gingivalis was correlated with an increase in the age of the patients. Study groups ranging from 25 to 45 years old and 45 to 60 years old revealed similar results. Two studies [27,28] reported a high prevalence of over 80% in the 45- to 60-year-old study group.
The Cell Cycle. The cell cycle is the sequence of events that controls cell growth and division. The G 1 phase, the longest part of the cycle, begins immediately after mitosis and includes all preparations for DNA replication. The period of DNA (and histone) synthesis is the S phase. In a short G 2 phase the cell prepares for division during ...
Apr 28, 2024 · Predict a cell's nuclear appearance from its functional characteristics. Predict the functional deficits accompanying specific nuclear or chromosomal aberrations. Predict the nuclear component(s) likely to be involved in a functional deficit. Explain the role of the nucleus in cell differentiation. + +
5 days ago · The large cell mass of Chaos contains many nuclei—up to several hundred—and numerous contractile vacuoles. Some of the cytoplasmic granules of Chaos are many times larger than those of amoeba. Difflugia lobostoma (131334) is an interesting amoeba with a shell ( test ), and it feeds on the freshwater alga Spirogyra .
The nucleus is the defining feature of the eukaryotic cell. It distinguishes eukaryotic cells from prokaryotic cells, which do not possess a nucleus. The primary function of the nucleus is to store and protect the DNA, which is coiled around proteins to form long strands called chromatin.
