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The Importance of Vacuoles - LS-Biology
The Importance of Vacuoles - LS-Biology

... vacuole. The expansion of vacuoles in plant cells occurs over time and eventually one vacuole can occupy 80% of the cell’s volume. Vacuoles are also found in animal cells, although they are not nearly as large. Another important function of these organelles is the disposal of waste and toxins. Vacuo ...
Chapter 2
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Cell Membrane /cell wall nucleus cytoplasm mitochondria
Cell Membrane /cell wall nucleus cytoplasm mitochondria

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BioCh7-A View of the Cell
BioCh7-A View of the Cell

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ABSTRACT Thirty-three aqueous methanolic
ABSTRACT Thirty-three aqueous methanolic

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Endocytosis 2 Types: 1. Phagocytosis 2. Pinocytosis

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Ch 3 Check Your Progress Answers BC Biology 12 3.1 p 67 1
Ch 3 Check Your Progress Answers BC Biology 12 3.1 p 67 1

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Cell-matrix mechanical crosstalk as key factor for improving

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Ch 6 Chapter summary - OHS General Biology
Ch 6 Chapter summary - OHS General Biology

... • The nucleus contains most of the genes in a eukaryotic cell. ○ Additional genes are located in mitochondria and chloroplasts. • The nucleus is separated from the cytoplasm by a double membrane called the nuclear envelope. ...
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cell structure and function

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cells and organellesreading

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Developmental Biology 8/e
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Comparing plant and animal cells

... Students start by looking at a mongoose in a natural setting, so both an animal and a plant are visible. They are prompted to think about how animals and plants differ in their behaviour. It would be good to get students to brainstorm their ideas about all the ways that animals and plants are simila ...
c-Jun N-terminal kinase plays a pivotal role in the maintenance of
c-Jun N-terminal kinase plays a pivotal role in the maintenance of

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< 1 ... 808 809 810 811 812 813 814 815 816 ... 1231 >

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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