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Targeting of P-Selectin to Two Regulated Secretory Organelles in
Targeting of P-Selectin to Two Regulated Secretory Organelles in

... plasma membrane when the truncated protein is expressed in nonneuroendocrine cells (29). In addition, it is becoming apparent that escape from the endosomeplasma membrane recycling itinerary to other destinations is a signal-mediated step (38). Together, these observations suggest that synaptophysin ...
Two-step process for photoreceptor formation inDrosophila
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Biology, 7e (Campbell)
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... 11) Which of the following comparisons between prokaryotic and eukaryotic cells is incorrect? A) The lack of organelles in prokaryotes means that they are structurally less complex than eukaryotes. B) The lack of internal membranes means that prokaryotes cannot compartmentalize function to the same ...
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... Nerve cells are unusual. Some of them look like a tree with many branches. The nerve cells that control your arm and leg muscles are as wide as other cells in your body, but they may be as long as one meter! Nerve cells live a long time; some of them live as long as sixty years! Nerve cells send mes ...
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... nucleate microtubules was demonstrated by heterologous expression of Arabidopsis g-tubulin in fission yeast lacking endogenous g-tubulin. Arabidopsis g-tubulin was able to bind MTOCs and nucleate microtubule assembly in Schizosaccharomyces pombe (Horio and Oakley, 2003). Another piece of evidence fa ...


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Glypican-1 Is a Vehicle for Polyamine Uptake in Mammalian Cells

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... among group of organisms. Cladistic analysis identifies and considers only those characteristics of organism that are evolutionary innovation-new characters that arise as lineage evolve over time. Characteristics that appear in recent part of lineage but not in its older members are called derived c ...
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Intranuclear localization of geminivirus DNA

... with a defective coat protein open reading frame resulted in fewer and smaller viral DNA-containing compartments. Nevertheless, nuclei infected with the mutant virus increased in size and in some cases showed chromosome condensation. Together, these results established that geminivirus infection alt ...
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Investigation of Leaf Stomata Lab Experiment for Section 5.2
Investigation of Leaf Stomata Lab Experiment for Section 5.2

... Lab Experiment for Section 5.2 Purpose: In this activity, you will be investigating the structure of the stomata within a spinach plant leaf and determine how it functions with regards to the process of photosynthesis. Objectives:  Students will be able to define the function of the stomata  Stude ...
The plant cytoskeleton: its significance in plant
The plant cytoskeleton: its significance in plant

... increasing, ...
< 1 ... 328 329 330 331 332 333 334 335 336 ... 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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