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Cells and Tissues - Mrs. Hille`s FunZone
Cells and Tissues - Mrs. Hille`s FunZone

... Cells are the building blocks of all living things Tissues are groups of cells that are similar in structure and function Anatomy of the Cell Cells are not all the same All cells share general structures Cells are organized into three main regions  Nucleus  Cytoplasm  Plasma membrane ...
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4/20 & 4/21 - 7th Grade Agenda

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... This particular eukaryotic cell happens to be an animal cell, but the cells of plants, fungi and protists are also eukaryotic. All bacteria have prokaryotic cells. Despite their apparent differences, these two cell types have a lot in common. They perform most of the same kinds of functions, and in ...
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Chapter 10 Section 2 Notes

...  Each chromosome consists of __________ identical “sister” ____________________.  When the cell ________________, the “sister” chromatids ________________ from each other.  _____________ chromatid goes to each of the ____________ new cells.  Each _______________ of chromatids is attached at an a ...
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... S Phase: In the S phase, the chromosomes containing the genetic code (DNA) are copied so that both of the new cells formed will have matching strands of DNA. This phase lasts about 18 to 20 hours. G2 Phase: In the G2 phase, the cell checks the DNA and prepares to start splitting into 2 cells. It la ...
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Chapter 2 – Chemistry of Life and the Cell

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Angiosperms III - University of Nebraska Omaha
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... a) small cells are less likely to burst than large cell; b) small cells are less likely to be infected by bacteria; c) small cells can better take up what they need from their environment; d) it takes less energy to make an organism out of small cells; e) small cells can "morph" more easily than lar ...
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1) Which organelles are present in only plant cells? The cell wall
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... Mitochondria, vacuoles, cytoplasm, a cell membrane, a cytoskeleton, and a nucleus can  be found in both plant and animal cells. Many of these play essential roles in the cells. The  mitochondria produce the energy that cells need to carry out life processes. The cell  membrane is what separates a ce ...
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3 - Cell Division (1)

... are shared by the newly created daughter cells. • The division of the cytoplasm and its contents happens in a process called cytokinesis. • Cytokinesis begins before mitosis is complete. In plant cells a new cell wall forms in the middle of the cell while animal cells tend to pinch in the middle to ...
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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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