Presentation on theme: "1 Review Name the two types of proteins that regulate the cell cycle and how do they work Form a Hypothesis Write a hypothesis about what you think would."— Presentation transcript:
11 Review Name the two types of proteins that regulate the cell cycle and how do they work Form a Hypothesis Write a hypothesis about what you think would happen if cyclins were injected into a cell during mitosis. How would you test your hypothesis 2 Compare and Contrast How are the growth of a tumor and the repair of a scrape on your knee similar and how are they different 3 Infer Why do you think it is important that cells have a “control system” to regulate the timing of cell division
2Ch 10 Cell Growth and Development 10.3 Regulating the Cell Cycle
3Controls on Cell Division Controlled by regulatory proteins both inside and outside the cellCan be turned on and offCells are stimulated to divide rapidly with a broken bone and slow when healing nears completion.
4CyclinsProteins that regulate the timing of the cell cycle.
5Regulatory Proteins Internal regulators External regulators Respond to events inside a cellAllow the cell cycle to proceed only once certain processes have occurredExternal regulatorsRespond to events outside the cellDirect cells to speed up or slow down the cell cycle.
6Regulatory Proteins Growth factors External regulators that stimulate the growth and division of cellsEmbryonic development and wound healing.
7Apoptosis Programmed cell death Plays a role in development in shaping structures- fingers.
8Cancer Uncontrolled cell growth Absorbs nutrients needed by other cells, blocks nerve connections, and prevents organs from functioning.
9Tumor Mass of cells from uncontrolled growth Benign tumor Noncancerous, does not spreadMalignant tumorCancerous, invades anddestroys surrounding tissueMetastasisSpread of cancer cells.
10Causes of CancerDefects in genes that regulate cell growth and divisionp53 gene defect is common, doesn’t respond to growth signalsNormally many defects or mutations are neededSources of gene defectsSmoking tobacco, radiation exposure, defective genes, and viral infection.
12Cancer Treatments Tumors can be removed by surgery Tumors treated with targeted radiationChemotherapyUse of compounds that kill or slow the growth of cancer cells.
13The Rise and Fall of Cyclins Scientists measured cyclin levels in clam eggs as the cells went through the cell cycle. The data is shown on the following slide.Cyclins are continually produced and destroyed. Cyclin production signals cells to enter mitosis and their destruction signal cells to enter interphase.
14Interpret Graphs How long does cyclin production last during a typical cell cycle in clams Infer During which part of the cell cycle dose cyclin production begin and how quickly is it destroyedPredict Suppose that the regulators that control cyclin production are no longer produced. What are two possible outcomes