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cells
cells

... • Concluded that “ cells come only from previously existing cells” ...
Aim: What is a cell? Do Now: On your paper. Notes are in
Aim: What is a cell? Do Now: On your paper. Notes are in

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... the scrapings, he became the first person to see the tiny singlecelled organisms that are now called bacteria. Leeuwenhoek’s many discoveries caught the attention of other researchers. Many other people began to use microscopes to see what secrets they could uncover about cells. ...
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CSP_7-16-01_outline.rtf

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... C. Onion Cells 1. Cut a small section of an onion scale. Peel off a thin layer of onion tissue. 2. Place onion layer onto slide. Make sure the layer is perfectly flat. 3. Stain the onion with iodine. CAUTION: IODINE STAINS CLOTHING AND SKIN. 4. Place a coverslip on the onion. 5. Observe the cells u ...
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... 26. On a laboratory exam, a student is asked to determine if the cells under a microscope are plant cells or animal cells. What might the student look for? a. chloroplasts and a cell wall c. a nucleus and ribosomes b. ribosomes and vacuoles d. a cell membrane and mitochondria 27. The diagram below r ...
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... • The cell membrane also controls the materials going into and out of the cell. • Most of the contents of a cell, including the fluid, is called the cytoplasm. • Organelles are part of the cytoplasm. Organelles are structures that have specific jobs inside the cell. ...
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... 3 reasons why cells divide instead of simply stopping growth: 1) To reproduce (by meiosis) 2) To replace lost or dead cells (by mitosis) 3) To grow the structure they are part of (by mitosis) In eukaryotes, cell division occurs in two major stages. The first stage, division of the cell nucleus, is c ...
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of the cell.
of the cell.

... b) Saw “many little boxes”  small rooms  cells. 2. Anton von Leeuwenhoek, 1675 a) Viewed living cells ...
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Asexual reproduction

... Red blood cells: 120 days Stomach lining cells: 2 days Skin cells: 20 days  You need mitosis and cell division to replace these cells.  In your body about 3 billion cells die every minutes. ADJH- H. Aucoin ...
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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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