7188783
Descrição
FlashCards por Kimberlee Hernandez, atualizado more than 1 year ago
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Criado por Kimberlee Hernandez
quase 8 anos atrás
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| Questão | Responda |
| Why do cells divide? (4) | -replace dead or damaged cells -growth of multicellular organisms (making more cells) -reproduction -"DNA overload |
| Mitosis functions in | Growth |
| DNA and proteins Packaged as chromatic | -euchromatin: lightly packaged (de condensed) -heterochromatin: tightly packaged (condensed) |
| Interphase (4) | •growth •normal cell functions •chromosomes copied •prepare to divide |
| Anchorage dependence | •most cells divide only when attached to a surface |
| Density-dependent inhibition | •cells continue dividing until they touch one another then stop |
| Internal regulators | •cycling increase causes cell to divide |
| Internal regulator : p53 gene | Halts cell cycle until DNA is repaired |
| External regulators | •growth factors (growth hormones) -proteins secreted by cells that stimulate other cells to divide -signal cell to divide |
| Checkpoints | Help regulate the cell cycle |
| Cancer cells | -Have abnormal cell cycles -caused by mutant genes regulating the cell cycle (p53 gene) -ignore checkpoints and other regulatory mechanisms -divide excessively, can form tumors |
| Malignant tumors | Can invade other tissues and may kill the organisms |
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