*sigh* This was covered in The God Delusion.
Chapter 4, pages 130 - 132.
Check it out.
2007-05-11 06:20:31
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answer #1
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answered by ZER0 C00L ••AM••VT•• 7
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It is created from evolution.
Take a look at:
http://www.talkorigins.org/indexcc/CB/CB200_1.html
It is amazing what natural selection can do over a few billion years.
Some cell us a rotary motor, other cells wave their 'tails' back and forth. So, a question back at you.
One method of propulsion must be more efficient than the other. If these cells were intelligently designed they would both use the more efficient method, and all mobile cells would use the same methodology.
In evolution if one type of cell mutates and develops a rudimentary rotary motor then over the generations it will evolve a more efficient rotary method of propulsion. If a different type of cell mutates and forms a rudimentary back and forth motor then over the generations it will evolve into a more efficient back and forth form of propulsion.
So, which hypothesis is supported by the evidence we see today?
(Hint, it is not Intelligent Design)
2007-05-11 13:38:52
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answer #2
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answered by Simon T 6
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Kenneth Miller, cell biologist from Brown University, has explained that one quite nicely in terms of evolutionary theory. Basically, each individual protein used to construct the "motor" does work independently as an adaptation without the whole of the machinery (for things like injecting substances into other cells). And then all you need is a one step nucleobase modification in one gene to put the various proteins in this motor together.
Additional--I see that in the 2-3 minutes it took me to type out and review my answer a lot of others answered, some with more detail than I had. Now its up to you. If you are intellectually honest (that's like not lying) you should admit that your basic education in biology is sorely lacking and you should do your best to rectify this....
2007-05-11 13:31:45
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answer #3
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answered by Dendronbat Crocoduck 6
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Evolution.
2007-05-11 13:21:07
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answer #4
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answered by Atheist Eye Candy 4
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Evolution.
2007-05-11 13:20:08
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answer #5
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answered by Eleventy 6
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Looks like sperm to me, but seriously, evolution is a part of nature, and if your god is nature (ie. not the god of the bible or any other religion), then I have no problem with saying it's created by god.
2007-05-11 13:23:07
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answer #6
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answered by Anonymous
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First of all I am not an atheist. I beleive in God NOT bible. I go to church AND I am not a Christian.
The first sentence says everything. Nature created it.
And nature is part of evolution.
2007-05-11 13:21:59
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answer #7
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answered by Anonymous
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Evolution. The question is, what makes you think otherwise? Just because someone is easily impressed doesn't indicate proof of a divine being or his handiwork.
2007-05-11 13:23:22
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answer #8
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answered by Hero and grunt 4
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The evolution of the bacterial flagellum is well explained. This is not evidence for a creator.
2007-05-11 13:22:45
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answer #9
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answered by Anonymous
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CLAIM:
Bacterial flagella and eukaryotic cilia are irreducibly complex, Since nonfunctional intermediates cannot be preserved by natural selection, these systems can only be explained by intelligent design.
1. This is an example of argument from incredulity, because irreducible complexity can evolve naturally. Many of the proteins in the bacterial flagellum or eukaryotic cilium are similar to each other or to proteins for other functions. Their origins can easily be explained by a series of gene duplication events followed by modification and/or co-option, proceeding gradually through intermediate systems different from and simpler than the final flagellum.
One plausible path for the evolution of flagella goes through the following basic stages (keep in mind that this is a summary, and that each major co-option event would be followed by long periods of gradual optimization of function):
1. A passive, nonspecific pore evolves into a more specific passive pore by addition of gating protein(s). Passive transport converts to active transport by addition of an ATPase that couples ATP hydrolysis to improved export capability. This complex forms a primitive type-III export system.
2. The type-III export system is converted to a type-III secretion system (T3SS) by addition of outer membrane pore proteins (secretin and secretin chaperone) from the type-II secretion system. These eventually form the P- and L-rings, respectively, of modern flagella. The modern type-III secretory system forms a structure strikingly similar to the rod and ring structure of the flagellum (Hueck 1998; Blocker et al. 2003).
3. The T3SS secretes several proteins, one of which is an adhesin (a protein that sticks the cell to other cells or to a substrate). Polymerization of this adhesin forms a primitive pilus, an extension that gives the cell improved adhesive capability. After the evolution of the T3SS pilus, the pilus diversifies for various more specialized tasks by duplication and subfunctionalization of the pilus proteins (pilins).
4. An ion pump complex with another function in the cell fortuitously becomes associated with the base of the secretion system structure, converting the pilus into a primitive protoflagellum. The initial function of the protoflagellum is improved dispersal. Homologs of the motor proteins MotA and MotB are known to function in diverse prokaryotes independent of the flagellum.
5. The binding of a signal transduction protein to the base of the secretion system regulates the speed of rotation depending on the metabolic health of the cell. This imposes a drift toward favorable regions and away from nutrient-poor regions, such as those found in overcrowded habitats. This is the beginning of chemotactic motility.
6. Numerous improvements follow the origin of the crudely functioning flagellum. Notably, many of the different axial proteins (rod, hook, linkers, filament, caps) originate by duplication and subfunctionalization of pilins or the primitive flagellar axial structure. These proteins end up forming the axial protein family.
The eukaryotic cilium (also called the eukaryotic flagellum or undulipodium) is fundamentally different from the bacterial flagellum. It probably originated as an outgrowth of the mitotic spindle in a primitive eukaryote (both structures make use of sliding microtubules and dyneins). Cavalier-Smith (1987; 2002) has discussed the origin of these systems on several occasions.
2. The bacterial flagellum is not even irreducible. Some bacterial flagella function without the L- and P-rings. In experiments with various bacteria, some components (e.g. FliH, FliD (cap), and the muramidase domain of FlgJ) have been found helpful but not absolutely essential (Matzke 2003). One third of the 497 amino acids of flagellin have been cut out without harming its function (Kuwajima 1988). Furthermore, many bacteria have additional proteins that are required for their own flagella but that are not required in the "standard" well-studied flagellum found in E. coli. Different bacteria have different numbers of flagellar proteins (in Helicobacter pylori, for example, only thirty-three proteins are necessary to produce a working flagellum), so Behe's favorite example of irreducibility seems actually to exhibit quite a bit of variability in terms of numbers of required parts (Ussery 1999).
Eukaryotic cilia are made by more than 200 distinct proteins, but even here irreducibility is illusive. Behe (1996) implied and Denton (1986, 108) claimed explicitly that the common 9+2 tubulin structure of cilia could not be substantially simplified. Yet functional 3+0 cilia, lacking many microtubules as well as some of the dynein linkers, are known to exist (Miller 2003, 2004).
3. Eubacterial flagella, archebacterial flagella, and cilia use entirely different designs for the same function. That is to be expected if they evolved separately, but it makes no sense if they were the work of the same designer.
2007-05-11 13:27:10
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answer #10
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answered by Anonymous
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