Biology: Cytokinesis
July 92010
http://www.mindbites.com/lesson/1456-biology-cytokinesis
Cytokinesis is the division of the cytoplasm that takes place after mitosis, producing two daughter cells. Professor Wolfe walks you through this process in both animal and plant cells. In an animal cell, the well membrane elongates due to the contraction of microfilaments actin and myosin. This contraction creates a cleavage furrow that will eventually produce two separate cells known as daughter cells. In plant cells, the same process isn’t possible, because of the rigid, non-cleavable cell wall. The Golgi apparatus in plant cells actually migrate to the middle of the cell, where they synthesize a new cell membrane. Then, proteins from the golgi vesicles are able to synthesize a new cell wall, creating two distinct cells.
Taught by Professor George Wolfe, this lesson was selected from a broader, comprehensive course, Biology. This course and others are available from Thinkwell, Inc. The full course can be found at http://www.thinkwell.com/student/product/biology. The full course covers evolution, ecology, inorganic and organic chemistry, cell biology, respiration, molecular genetics, photosynthesis, biotechnology, cell reproduction, Mendelian genetics and mutation, population genetics and mutation, animal systems and homeostasis, evolution of life on earth, and plant systems and homeostasis.
George Wolfe brings 30+ years of teaching and curriculum writing experience to Thinkwell Biology. His teaching career started in Zaire, Africa where he taught Biology, Chemistry, Political Economics, and Physical Education in the Peace Corps. Since then, he’s taught in the Western NY region, spending the last 20 years in the Rochester City School District where he is the Director of the Loudoun Academy of Science.
Besides his teaching career, Mr. Wolfe has also been an Emmy-winning television host, fielding live questions for the PBS/WXXI production of Homework Hotline as well as writing and performing in “Football Physics” segments for the Buffalo Bills and the Discover Channel.
His contributions to education have been extensive, serving on multiple advisory boards including the Cornell Institute of Physics Teachers, the Cornell Institute of Biology Teachers and the Harvard-Smithsonian Center for Astrophysics SportSmarts curriculum project. He has authored several publications including “The Nasonia Project”, a lab series built around the genetics and behaviors of a parasitic wasp.
He has received numerous awards throughout his teaching career including the NSTA Presidential Excellence Award, The National Association of Biology Teachers Outstanding Biology Teacher Award for New York State, The Shell Award for Outstanding Science Educator, and was recently inducted in the National Teaching Hall of Fame.
Duration : 0:3:4
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July 9th, 2010 at 3:37 pm
great job keep it up
great job keep it up
July 9th, 2010 at 3:37 pm
ahhh you stopped at …
ahhh you stopped at the part i needed!!