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chapter 9
| Question | Answer |
|---|---|
| Cell cycle | process of cellular reproduction, occurring in three main stages |
| Chromatin | relaxed form of dna in the nucleus of a cell |
| Chromosome | dna-containing structure that carries genetic material from one generation to another |
| Cytokinesis | third main stage of the cell division by stimulating production of proteins required for mitosis |
| Interphase | first stage of the cell cycle, during which a cell grows, matures and replicates its dna |
| Mitosis | second main stage of the cell cycle during which the cell's replicate dna divides and two genetically identical diploid daughter cells are produced |
| Anaphase | third stage of mitosis in which sister chromatids are pulled apart and microtublues, along with motor proteins move the chomosomes to opposite poles of the cell |
| Centromere | cell structure that joins two sister chromatids |
| Metaphase | second stage of mitosis in which motor proteins pull sister chromatids to the cell's equator |
| Prophase | first stage of mitosis, during which the cell's chromatin condenses into chromosomes |
| Sister chromatid | structure that contains identical dna copies and formed during dna replication |
| Spindle apparatus | structure made of spindle fibers, centrioles, and aster fibers that is involved in moving and organizing chromosomes before the cell divides |
| Telophase | last stage of mitosis in which nucleoli reappear. Two new nuclear memberanes begin to form, but the cell has not yet completely divided |
| Apoptosis | programmed cell death |
| Cancer | uncontroled growth and division of cells that can be caused by changes in control of the cell cycle and also may be caused by environmental factors |
| Carcinogen | cancer-causing substance |
| Cyclin | one of the specific proteins that regulate the cell cycle |
| Stem cell | unspecialized cell that can develop into a specialized cell under the right conditions |
| dependent kinase | enzyme to which cyclin binds during interphase and mitosis, triggering and controlling activities during the cell cycle |