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Chromosome replication
Cell Cycle The cell cycle is the process by which a cell grows, duplicates its DNA, and divides into identical daughter cells. Cell cycle duration varies according to cell type and organism. In mammals, cell division occurs over a period of approximately twenty-four hours. In multicellular... Read more |
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convective cell
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somatic crossing-over
somatic crossing-over In genetics, crossing-over during mitosis of somatic cells, such that parent cells heterozygous for a given allele, instead of giving rise to two identical heterozygous daughter cells, give rise to daughter cells one of which is homozygous for one of these alleles, the other... Read more |
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Nephroblastoma
Wilms' Tumor Definition Wilms' tumor is a cancerous tumor of the kidney that usually occurs in young children. It is named for Max Wilms, a German surgeon (1867–1918) and is also known as a nephroblastoma. Description When an unborn baby is developing, the kidneys are formed from... Read more |
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endomitosis
endomitosis The replication of chromosomes in the absence of cell or nuclear division, resulting in numerous copies within each cell. It occurs notably in the salivary glands of Drosophila and other flies. Cells in these tissues contain giant chromosomes (see polyteny), each consisting of over a... Read more |
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Transport
Transport Transport is the controlled movement of substances from one part of a cell to another, or from one side of a cell membrane to the other. Because each cell must maintain an internal environment different from the external environment, it must regulate the movement of... Read more |
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Atmospheric circulation
Atmospheric circulation Atmospheric circulation is the movement of air at all levels of the atmosphere over all parts of the planet. The driving force behind atmospheric circulation is solar energy, which heats the atmosphere with different intensities at the equator, the middle latitudes, and the... Read more |
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White blood cells
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three-cell model
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hypodermis
hypodermis (exodermis) The outermost layer of cells in the plant cortex, lying immediately below the epidermis. These cells are sometimes modified to give additional structural support or to store food materials or water. After the loss of the piliferous layer of the root the hypodermis takes over... Read more |
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