Re: The Illusion of Design
- From: hersheyh@xxxxxxxxxxx
- Date: 27 Oct 2005 07:21:37 -0700
thissteve wrote:
> Jeffrey Turner wrote:
> > People have a hard time
> > believing that so simple a mechanism could deliver such powerful
> > results.
>
> It's just quite a leap to extrapolate changing a moth color to building
> a ribosome. Sorry.
Why? Seriously. It is clear that the key component of the ribosome is
its RNA. The RNA, by itself, has weak ability to perform the function
of the entire ribosome. The many protein components basically act to
enhance a function that is already there. There is clearly no problem
for evolution in going from something that has a function to one that
does that function somewhat better. And this would involve co-opting
any protein which bound to RNA (and lots of proteins do) and
marginally, but significantly, increased the efficiency of the core
RNA.
As for the *assembly* of the ribosome's proteins onto the RNA, that
occurs spontaneously in test tubes, so there is no reason to think the
same doesn't happen in an organism. Again, proteins glomming onto
other molecules is hardly unusual activity.
So, quite seriously, where do you see any of the many steps in the
process of producing the modern (although it is hard to call something
that became fixed into its basic structure billions of years ago
'modern') ribosome that is impossible *in principle*?
.
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