RE: Intelligent Design: Irreducible Complexity?
August 14, 2014 at 4:02 pm
(This post was last modified: August 14, 2014 at 4:09 pm by The Grand Nudger.)
Phototropism in plants is achieved by way of auxin (essentially a growth hormone). When the photoreceptive proteins in plant tissue (called phototropins) register a signal, auxin on the shaded side of the stem releases hydrogen ions - setting in motion a cascade of chemistry leading to the release of enzymes called expansins - which cause the cell to swell and bend -towards- the light. We're not even sure that the photoreceptors are necessary, as auxin appears to be photophobic in it's own right. Course, one could simply say that auxin functions as a sort of inverted receptor in any case. I don't think that you could really say that the plant "knows what to do" in either case, it's just chemistry. Or would you disagree?
Photoperiodism and circadian rhythm are also establish in plants by similar, boring, chemical processes. None of which seem to require any "knowing". I used phototropism above because it's a much more fantastic and noticeable "reaction" to light than either - and it doesn;t seem to be "irreduceable complex" - despite being much more (seemingly)complicated than other processes that plants go through.
Photoperiodism and circadian rhythm are also establish in plants by similar, boring, chemical processes. None of which seem to require any "knowing". I used phototropism above because it's a much more fantastic and noticeable "reaction" to light than either - and it doesn;t seem to be "irreduceable complex" - despite being much more (seemingly)complicated than other processes that plants go through.
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