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Virtual Microscope lab Go to http://www.udel.edu/biology/ketcham
Virtual Microscope lab Go to http://www.udel.edu/biology/ketcham

... Center the “e” over the iris (opening) of the stage so that the light goes through the “e”. You will do this each time you switch slides. Switch views to view the “e” through the microscope. Select checklist to make sure you are following the correct steps. Focus using the course focus knob until th ...
Cell division
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1. Name two functions of the cell membrane

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CELL DIVISION Mitosis
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cell organelle poster project
cell organelle poster project

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Cell Transport (Diffusion and Osmosis)
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... will be exported by the cell. It also controls the Calcium level in muscles and detoxifies poisons, alcohol, and drugs. Color and label the smooth ER light green. Chloroplasts are elongated or disc-shaped organelles containing chlorophyll that trap sunlight for energy. Photosynthesis (in which energ ...
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Chapter 6: A Tour of the Cell
Chapter 6: A Tour of the Cell

... both questions.) Chloroplasts and mitochondria both have ribosomes and their own DNA. You will learn later about their evolution, but for now hold onto these facts. They are semiautonomous organelles that grow and reproduce within the cell. And you’re lucky today— there is not a question here! ...
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Chapter Three: Cells: The Basic Units of Life Teacher Notes Lesson

... -keeps cell membrane from collapsing; may help some cells move -made of three types of proteins -one is a hollow tube -others are long, stringy fibers -Nucleus-a large organelle in a eukaryotic cell -contains DNA which contains information to make protein -proteins control chemical reactions in a ce ...
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Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
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