cells cells what are cells and are they all the same? how do we know they exist if we cannot see...

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  • Slide 1
  • Cells Cells What are cells and are they all the same? How do we know they exist if we cannot see them? www.worldofteaching.com
  • Slide 2
  • Slide 3
  • Some Random Cell Facts The average human being is composed of around 100 Trillion individual cells!!! It would take as many as 50 cells to cover the area of a dot on the letter i WOW!!!
  • Slide 4
  • http://www.biosci.ohiou.edu/introbioslab/Bi os170/170_5/Chk_cell.JPG http://serenalegeremicroscopy.weebly.com/uploads/1/4/ 6/7/14673604/7521071_orig.jpeg?0 http://cdn.c.photoshelter.com/img- get/I0000ITnK5jj64zM/s/500/400/PX09-003e.jpg http://www.popsci.com/sites/popsci.com/files/images/2010/01/ner vecell.jpg http://us.123rf.com/400wm/400/400/lightwise/lightwis e1203/lightwise120300022/12668156-bacteria-and- bacterium-cells-floating-in-microscopic-space.jpg
  • Slide 5
  • Anton van Leeuwenhoek In the mid 1600s Leeuwenhoek is thought of as discovering the first practical microscopes. Leeuwenhoek in 1674 was the first to see 1. bacteria, yeast, and plants 1. bacteria, yeast, and plants 2. life in a drop of water 2. life in a drop of water 3. circulation of blood corpuscles in 3. circulation of blood corpuscles in capillaries capillaries
  • Slide 6
  • Discovery of Cells 1665- English Scientist, Robert Hooke, discovered cells while looking at a thin slice of cork (dead cells from oak bark). He described the cells as tiny boxes or a honeycomb He thought that cells only existed in plants and fungi
  • Slide 7
  • Development of Cell Theory 1838- German Botanist, Matthias Schleiden, concluded that all plant parts are made of cells 1839- German physiologist, Theodor Schwann, who was a close friend of Schleiden, stated that all animal tissues are composed of cells.
  • Slide 8
  • Development of Cell Theory 1858- Rudolf Virchow, German physician, after extensive study of cellular pathology, concluded that cells must arise from preexisting cells.
  • Slide 9
  • The Cell Theory Complete The 3 Basic Components of the Cell Theory were now complete: 1. The cell is the basic unit of life in all living things. 2. All organisms are composed of one or more cells. 3 All cells are produced by the division of preexisting cells. http://ed.ted.com/lessons/the-wacky-history-of-cell-theory
  • Slide 10
  • Scientists have found two basic types of cells: 1. Prokaryotic cells are those that have no membrane around their nuclear material. Prokaryotic vs. Eukaryotic Example include bacteria and pond scum cells. www.uic.edu/classes/bios/bios100/summer2002/prok.jpg Involved in - cell division
  • Slide 11
  • Bacterial Cells Unlike plant and animal cells, bacterial cells are prokaryotic. They do not have membrane- bound organelles, nor nuclei. They do have: ribosomes, a single chromosome, a cell wall, and cytoplasm. Reproduction: asexual or sexual? Good and bad bacteria?
  • Slide 12
  • 2. Eukaryotic cells have a membrane bound nucleus. Animal and plant cells are eukaryotic.
  • Slide 13
  • Animal Cells Animal cells are eukaryotic Every cell in your body is constantly active and has a specific function. For example, a nerve cell has a job that is much different than a muscle cell. Each cell has several structures inside, and each structure has a specific job. These structures are called organelles.
  • Slide 14
  • Plant Cells (eukaryotic) The major difference between a plant cell and an animal cell is that plant cells have cell walls. A cell wall is a rigid structure outside the cell membrane that supports and protects the plant cell. http://creationwiki.org/Image:Cellwall.jpg
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  • Plant cells continued: 2. Plants also differ from animal cells because they can make their own food. 3. Organelles called chloroplasts convert light energy into chemical energy in the form of sugar. 4.One of the chemicals in chloroplasts, chlorophyll, traps light energy
  • Slide 16
  • Organization of Cells A one-celled organism (unicellular) performs all of lifes functions by itself An example is bacteria A multicellular organism, however, does not work independently. Each cell depends on other cells to carry on all of lifes functions. In a multicellular organism, cells are organized into tissues. Tissues are groups of similar cells that do the same sort of work. Cells->Tissues- >Organs -> Organ system -> Organism
  • Slide 17
  • 1. http://www.laney.edu/wp/leslie_blackie/files/2009/05/elodea.jpg 2. http://v2.educonv.com/pars_docs/refs/245/244207/244207_html_m36b 87e3c.jpg 3. http://grauhall.com/catalog/images/3862046%20Cocci%20in%20chain s%20400x.jpg 4. http://botany.cz/foto/spacek-sb1.jpg What kind of cells did you see?
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  • 5. 6. http://pharmacyrepublic.com/blog/wp-content/uploads/2013/10/Red- Blood-Cells-Pharmacyrepublic-Kidney-Failure-Blog.jpg 7. http://31.media.tumblr.com/0a48899e3b896b28a8cc1b9321bca1cf/tum blr_mq1wexvOIo1s4sgqko6_r1_1280.jpg 8. http://upload.wikimedia.org/wikipedia/commons/1/1c/Mikrofoto.de-volvox-4.jpg
  • Slide 19
  • All cells contain???? Cell membrane DNA Cytoplasm Ribosomes
  • Slide 20
  • Differences in Animal and plant cells (eukaryote) ? Animal Centrioles Lysomes Irregular shape Plant Chloroplasts Cell Wall Central vacuole Rectangular shape

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