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Lecture 20

BIOL 1000 Lecture 20: Biology Lecture 20

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University of Manitoba
Biological Sciences
BIOL 1000
Kevin G.Scott

st Oct. 31 , 2016 Biology Lecture 20: Life cycle is how organisms such as humans grow and go different places??? Frequency of cell division varies with the type of cell E.g mouth cells repair quickly, injury to spinal cord cells dont repair that well, tend not to divide. These cell cycle differences results from regulation at the molecular level Cell cycle appears to be driven by specific chemical signals present in cytoplasm *****All cells contain the same DNA, they are just specialized to do different things. Sequential events of the cell cycle are directed by a distinct cell cycle control system , which is similar to a clock regulated by internal and external cues There are different checkpoints in order for cells to divide. Each checkpoint a cell could stop dividing. For many cells, the G1 checkpoint seems to be the most important one If a cell receives the go ahead signal at the g1 checkpoint, it will usually complete the rest of the cell cycle(s, G2, M phases) and divide. If the cell doesnt receive the go ahead signal, it will exit the cycle, switching into a non dividing state called the G Zero phase. Most internal signals send molecular signals that delay anaphase Some external signals are growth factors, proteins released by certain cells that stimulate other cells to divide Cancer cells do not respond normally to the bodys control mechanism Cancer cells may not need growth factors to grow and divide. External information tells cells to divide. Cancer cells act as if they have a signal to grow and divide when they dont have it. 1.) List the phases of the cell cycle; describe the sequence of events during each phase 2.) List the phases of mitosis and describe the events characteristic of each phase 3.) Draw or describe the mitotic spindle, including centrosomes, kinetochores and asters 4. Compare cytokinesis in animals and plants 5.) Describe the process of binary fission in bacteria Be able to do the above things Living organisms are distinguished by their ability to reproduce their own kind
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