[quote]pushharder wrote:
DrSkeptix wrote:
Appeals to authority are not useful without data. My passing acquaintance with Pauling, Szent-Georgy, Berg, Kornberg (the father–the son was a hermit) and Lederberg are not useful except as name-dropping to get the chicks.
I understand but I don’t have the wherewithall to start pumping out reams of data here on TN and as I said, I am just a layman.
[/quote]
Of course! We are all layman, which is wonderful!
How about this version of flagellar history?
"[i]Doubters of evolution are fond of pointing out that the flagellum, as this tail is called, needs every one of its parts to function. They argue that it could not have evolved bit by bit; it must have been created in its present form.
But by comparing the flagellar proteins to those in other bacterial structures, Mark Pallen of the University of Birmingham in England and his colleagues have found clues to how this intricate mechanism was assembled from simpler parts. For example, E. coli builds its flagellum with a kind of pump that squirts out proteins. The pump is nearly identical, protein for protein, to another pump found on many disease-causing bacteria, which use it not for building a tail but for priming a molecular syringe that injects toxins into host cells. The similarity is, in Pallen’s words, “an echo of history, because they have a common ancestor.”
Scientists have discovered enough of these echoes to envision how E. coli’s flagellum could have evolved. Pallen proposes that its pieces�all of which have counterparts in today’s microbes�came together step-by-step over millions of years. It all started with a pump-and-syringe assembly like those found on pathogens. In time, the syringe acquired a long needle, then a flexible hook at its base. Eventually it was linked to a power source: another kind of pump found in the cell membranes of many bacteria. Once the structure had a motor that could make it spin, the needle turned into a propeller, and microbes had new mobility.
Whether or not that’s the full story, there is plenty of other evidence that natural selection has been at work on the flagellum. Biologists have identified scores of different kinds of flagella in various strains of bacteria. Some are thick and some are thin; some are mounted on the end of the cell and some on the side; some are powered by sodium ions and some by hydrogen ions. It’s just the kind of variation that natural selection is expected to produce as it tailors a structure to the needs of different organisms.[/i]" (http://carlzimmer.com/articles/2006.php?subaction=showfull&id=1177181530&archive=&start_from=&ucat=9&)
Plausible explanations may not satisfy every critic, but no critic can dismiss them all, “with a wave of the hand.”
Enough self-flagellation for one day!