Dr. Surbhi I have no idea
2006-09-04 06:38:24
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answer #1
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answered by Anonymous
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Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. This feature was lost in the distant past by the single-celled organisms that gave rise to the kingdom Animalia.
The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues.
||Littele Extra Dose||
Cells were discovered in 1665 by British scientist Robert Hooke who first observed them in his crude (by today's standards) seventeenth century optical microscope. In fact, Hooke coined the term "cell", in a biological context, when he described the microscopic structure of cork like a tiny, bare room or monk's cell. Illustrated in Figure 2 are a pair of fibroblast deer skin cells that have been labeled with fluorescent probes and photographed in the microscope to reveal their internal structure. The nuclei are stained with a red probe, while the Golgi apparatus and microfilament actin network are stained green and blue, respectively. The microscope has been a fundamental tool in the field of cell biology and is often used to observe living cells in culture. Use the links below to obtain more detailed information about the various components that are found in animal cells.
2006-09-01 00:32:43
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answer #2
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answered by Anonymous
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Animalia Cell Wall
2017-02-23 15:02:22
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answer #3
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answered by Anonymous
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it provides the structure and support a plant requires to remain tough. plants dont need to wander around to get food so they need the cellulose in their cell walls to remain rigid. Animals need to move around so they dont need the cellulose to stop them from falling over and such
2006-08-31 23:09:44
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answer #4
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answered by Anonymous
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so that we can be fluid and move. cell walls provide the rigid structure that you see in plants. Animals must move to survive, plants must remain still.
2006-08-31 23:12:15
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answer #5
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answered by liz n 3
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its absent because we don't have any process with which to produce cellulose (which makes up cell wall).
2006-08-31 23:35:42
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answer #6
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answered by kcbm 3
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SORRRRRRRRRRRRRRYYYYYYYYYYYY!!!!!!!!!!!!!!!!!!!!!
AFTER SUCH A LONG TIME.......AND YA EXPECT ME TO GIVE A SERIOUS ANSWER....NOWAYS!!!!!!
uuuuummmmm..........lemme think............uuuuuuuummmmmm
IF ANIMALS CAN DO WITHOUT BRAINS,THEN WHY CAN'T THEY DO WITHOUT A CELL WALL.........!!!!
2006-08-31 23:54:49
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answer #7
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answered by BLACK KILLZ.....!?! 3
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