Friday, January 4, 2008

Glossary.

Cell Division- the division of a cell in reproduction or growth.

Chromatid- A chromatid is one of two identical copies of DNA making up a chromosome that are joined at their centromeres, for the process of nuclear division (mitosis or meiosis).
Centromere- a specialized structure on the chromosome, appearing during cell division as the constricted central region where the two chromatids are held together and form an X shape.
Interphase- The stage of a cell between two successive mitotic or meiotic divisions.

Cell Cycle- the cycle of growth and asexual reproduction of a cell, consisting of interphase followed in actively dividing cells by prophase, metaphase, anaphase, and telophase.

Mitosis-the usual method of cell division, characterized typically by the resolving of the chromatin of the nucleus into a threadlike form, which condenses into chromosomes, each of which separates longitudinally into two parts, one part of each chromosome being retained in each of two new cells resulting from the original cell.

Prophase-Cell Biology. the first stage of mitosis or meiosis in eukaryotic cell division, during which the nuclear envelope breaks down and strands of chromatin form into chromosomes.

Centriole-a small, cylindrical cell organelle, seen near the nucleus in the cytoplasm of most eukaryotic cells, that divides in perpendicular fashion during mitosis, the new pair of centrioles moving ahead of the spindle to opposite poles of the cell as the cell divides: identical in internal structure to a basal body.

Spindle-a splindle shaped structure, composed of microtubules, that forms near the cell nucleus during mitosis or meiosis and, as it divides, draws the chromosomes to opposite poles of the cell.

Metaphase- The stage of mitosis and meiosis, following prophase and preceding anaphase, during which the chromosomes are aligned along the metaphase plate.

Anaphase- The stage of mitosis and meiosis in which the chromosomes move to opposite ends of the nuclear spindle.
Telophase- The final stage of mitosis or meiosis during which the chromosomes of daughter cells are grouped in new nuclei.Cytokinesis- The division of the cytoplasm of a cell following the division of the nucleusCyclin- A class of proteins that fluctuate in concentration at specific points during the cell cycle and that regulate the cycle by binding to a kinase.Cancer- Any of various malignant neoplasms characterized by the proliferation of anaplastic cells that tend to invade surrounding tissue and metastasize to new body sites.
Cytokinesis- The division of the cytoplasm of a cell following the division of the nucleusCyclin- A class of proteins that fluctuate in concentration at specific points during the cell cycle and that regulate the cycle by binding to a kinase.Cancer- Any of various malignant neoplasms characterized by the proliferation of anaplastic cells that tend to invade surrounding tissue and metastasize to new body sites.

Cyclin- A class of proteins that fluctuate in concentration at specific points during the cell cycle and that regulate the cycle by binding to a kinase.

Cancer- Any of various malignant neoplasms characterized by the proliferation of anaplastic cells that tend to invade surrounding tissue and metastasize to new body sites.

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