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... Capillaries ...
Developmental Biology 8/e
Developmental Biology 8/e

... Figure 7.5 Stages of egg maturation at the time of sperm entry in different animal species. The germinal vesicle is the name given to the large diploid nucleus of the primary oocyte. The polar bodies are seen as smaller cells. (After Austin 1965.) ...
BIOLOGY 101. Which one of the following is not true about lichens
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Epithelial Tissues

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Chapter 5 Homeostasis and Transport
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Cell Notes Part 1 & 2
Cell Notes Part 1 & 2

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Cell - Cloudfront.net
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... • These are found in the nucleus when the cell divides. • generally appear in animal cells • they look like two cylinders at right angles to one another • when viewed with an electron microscope, the cylinders show up as nine bundles of tiny microtubules arranged in a circle ...
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AP Biology
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Cell Structure & Function
Cell Structure & Function

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Parts of the Animal Cell

... separated from the cytoplasm by a double phospholipid membrane (similar to the plasma membrane) called the nuclear membrane. The cell’s DNA is inside the nucleus. The DNA is packaged into 46 chromosomes. The nuclear envelope is an extra layer of protection for the DNA from anything harmful that migh ...
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Ch 3 – Cell Structure The Cell Theory

... – They interfere with other cellular functions – Examples: Pompe’s disease - genetic disorder caused by a deficiency or dysfunction of the lysosomal hydrolase which breaks down glycogen. The build-up of glycogen causes progressive muscle weakness throughout the body and affects various body tissues, ...
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A. Why is cell division important?

... 1. Organisms with eukaryotic cells asexually reproduce by cell division. 2. However, bacteria do not have a nucleus so they can’t use mitosis. Instead, bacteria reproduce asexually by fission. 3. During fission, an organism whose cells do not contain a nucleus copies its genetic material and then di ...
Slide ()
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Cell Structure & Function
Cell Structure & Function

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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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