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Mary Pilson
Mary Pilson

... AP/DE Biology GR Cell Structures, Transport, & Communication Ch 4 and Ch 5 ...
Cell Quizzam
Cell Quizzam

... _____ 7. Which of the following is best observed by using a compound light microscope? A. A eukaryotic cell B. A virus C. A DNA sequence D. The inner structure of a mitochondrion E. A nuclear pore _____ 8. Which of the following cells would most likely have the greatest concentration of densely pack ...
cell - admms
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Cells and Systems Unit Test
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... Scientists studied the kingdoms of Bacteria and Archaea at a genetic and cellular level, it was determined that they were very much different. These were elevated to domain status, higher then kingdom. All other kingdoms were placed in a third domain called Eukarya. In the domain of Eukarya, the org ...
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... o What is the difference between the Smooth ER and the Rough ER: ______________________________ ____________________________________________________________________________________ ...
Studying gene expression at the level of the single cell
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... Procedures Preparation: Cells There should be a large illustration of both a plant and an Animal cell drawn or taped to the chalk board (note: This can also be modified to compare prokaryotic and eukaryotic cells). The cells must be empty but labeled as the type of cell they are illustrating. Cell o ...
Cells Investigating cells 1- State what are the basic units of all living
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... 1- Nuclear division yes yes 2- Division of cytoplasm yes yes 3- New cell wall forming yes no 4- Separation into two daughter yes yes cells 1- Chromosomes get shorter and fatter. The cell is ready for mitosis. 2- Chromosome are attached to spindle fibres and positioned at the equator (plane at the ce ...
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... adjusting the lighting where he worked, enabled him to build microscopes that magnified over 200 times, with clearer and brighter images than any of his colleagues at that time. ...
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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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