Biological complexity: more cell pore complexity (Introduction)

by dhw, Wednesday, May 04, 2016, 12:24 (3126 days ago) @ David Turell

DAVID: The nuclear pore can now be visualized, as this paper shows, controlling the flow of molecules in and out of the nuclear membrane:
http://www.the-scientist.com/?articles.view/articleNo/46003/title/Observing-the-Nuclear...
David's comment: Look at the high speed image, kind of grainy but you can see the movement of the parts. In previous entries I've shown the complexity of the molecules that make up the pore. Not invented by chance or by cell communities, since each cell has a nucleus which must work at the start. Remember unicellular organisms have no nucleus… -First of all, you know as well as I do that although bacteria do not have a nucleus, there are single-celled eukaryotes that do.
 
DAVID: …so multicellularity involves inventing it. We now must consider unicellular organisms in an invention committee communicating their proposed plans for the nucleus, which then arrives full-blown; communicating how? I see a hypothesis sinking.-Secondly, again you know perfectly well that single cells do communicate and do cooperate, and you have posted many articles explaining how they do it (thank you again). Of course, it is part of the game to exploit poor old dhw's inability to solve puzzles such as the origin of life, multicellularity, the mechanism for innovation, consciousness etc. which nobody else including yourself can solve, but in this particular case, the puzzle involves the evolution of prokaryotes into eukaryotes, and someone else came up donkey's years ago with a now widely accepted theory:-	From prokaryotes to eukaryotes - Understanding Evolution
evolution.berkeley.edu/evolibrary/article/_0/endosymbiosis_03
(Sorry, but once again I can't establish the link.)-QUOTE: “The complex eukaryotic cell ushered in a whole new era for life on Earth, because these cells evolved into multicellular organisms. But how did the eukaryotic cell itself evolve? How did a humble bacterium make this evolutionary leap from a simple prokaryotic cell to a more complex eukaryotic cell? The answer seems to be symbiosis — in other words, teamwork. 
Evidence supports the idea that eukaryotic cells are actually the descendents of separate prokaryotic cells that joined together in a symbiotic union. In fact, the mitochondrion itself seems to be the "great-great-great-great-great-great-great-great-great granddaughter" of a free-living bacterium that was engulfed by another cell, perhaps as a meal, and ended up staying as a sort of permanent houseguest. The host cell profited from the chemical energy the mitochondrion produced, and the mitochondrion benefited from the protected, nutrient-rich environment surrounding it. This kind of "internal" symbiosis — one organism taking up permanent residence inside another and eventually evolving into a single lineage — is called endosymbiosis.”-This was Lynn Margulis's theory, and Lynn Margulis was a champion of cellular intelligence. You may not believe the theory (which would appear to involve an initial degree of chance followed by intelligent cooperation), but you can argue about it with the ghost of Margulis or with all the other specialists who agree with her. -Finally, the hypothesis over which we disagree concerns how evolution works, not how the mechanism for evolution came into existence. Once more, I cannot see how the long acknowledged complexity of the cell provides any more support for your divine preprogramming or direct guidance of all innovations, lifestyles and natural wonders than it does for the possibly divine design of an autonomous, inventively intelligent mechanism to produce the same innovations etc. The hypothesis remains afloat.