* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 5.3 Regulation of the Cell Cycle
Survey
Document related concepts
Tissue engineering wikipedia , lookup
Endomembrane system wikipedia , lookup
Extracellular matrix wikipedia , lookup
Cell encapsulation wikipedia , lookup
Biochemical switches in the cell cycle wikipedia , lookup
Cellular differentiation wikipedia , lookup
Cell culture wikipedia , lookup
Organ-on-a-chip wikipedia , lookup
Cytokinesis wikipedia , lookup
Cell growth wikipedia , lookup
Transcript
13.1 Ecologists Study Relationships Today’s Learning Log Questions: 1.What is cancer? What are the two types of tumors? 2.What is asexual reproduction? What type of asexual reproduction occurs in prokaryotes? What type of asexual reproduction occurs in eukaryotes? 5.3 Regulation of the Cell Cycle KEY CONCEPT Cell cycle regulation is necessary for healthy growth. 5.3 Regulation of the Cell Cycle Internal and external factors regulate cell division. • External factors include physical and chemical signals. • Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells. 5.3 Regulation of the Cell Cycle • Two of the most important internal factors are kinases and cyclins. • External factors trigger internal factors, which affect the cell cycle. 5.3 Regulation of the Cell Cycle • Apoptosis is programmed cell death. – a normal feature of healthy organisms – caused by a cell’s production of self-destructive enzymes – occurs in webbed fingers development of infants 5.3 Regulation of the Cell Cycle Cell division is uncontrolled in cancer. • Cancer cells form disorganized clumps called tumors. – Benign tumors remain clustered and can be removed. – Malignant tumors metastasize, or break away, and can form more tumors. normal cell cancer cell bloodstream 5.3 Regulation of the Cell Cycle • Cancer cells do not carry out necessary functions. • Cancer cells come from normal cells with damage to genes involved in cell-cycle regulation. 5.3 Regulation of the Cell Cycle • Carcinogens are substances known to promote cancer. • Standard cancer treatments typically kill both cancerous and healthy cells.