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Dave W.
Info Junkie

USA
26016 Posts

Posted - 04/22/2014 :  09:11:04  Show Profile  Visit Dave W.'s Homepage Send Dave W. a Private Message  Reply with Quote
Some of you may remember The Inner Life of the Cell, a gorgeous animation of some of the biological processes that go on inside the cells of living animals, created eight years ago. The "Intelligent Design" crowd loved the video, too, because - due to choices made by the creators about what to emphasize - it showed neat, orderly, intentional molecular mechanisms. Nothing better, from an ID perspective, than proteins flying together out of nowhere to build a structure, or a kinesin molecule marching along without a misstep.

Well, the creators realized that they hadn't done the biology real justice, and so have created another video, called Protein Packing, which shows things a lot more like how they really are.

As Carl Zimmer points out:
Once more we see a vesicle being hauled by kinesin. But in this version, the kinesin doesn’t look like a molecule out for a stroll. Its movements are barely constrained randomness.

Every now and then, a tiny molecule loaded with fuel binds to one of the kinesin “feet.” It delivers a jolt of energy, causing that foot to leap off the molecular cable and flail wildly, pulling hard on the foot that’s still anchored. Eventually, the gyrating foot stumbles into contact again with the cable, locking on once more — and advancing the vesicle a tiny step forward.

...

The new movie helps us understand biology at a deeper level, too. In the 2006 version, we can’t help seeing intention in the smooth movements of the molecules; it’s as if they’re trying to get from one place to another. In reality, however, the parts of our cells don’t operate with the precise movements of the springs and gears of a clock. They flail blindly in the crowd. Our cells work almost in spite of themselves.
As a bonus, PZ Myers cites actual papers on how kinesin moves, and links to IDist Jonathan Wells' outright denial of reality.

- Dave W. (Private Msg, EMail)
Evidently, I rock!
Why not question something for a change?
Visit Dave's Psoriasis Info, too.

Kil
Evil Skeptic

USA
13470 Posts

Posted - 04/22/2014 :  13:30:14   [Permalink]  Show Profile  Visit Kil's Homepage  Send Kil an AOL message  Send Kil a Yahoo! Message Send Kil a Private Message  Reply with Quote
Yep. In fact, for the movie, Expelled, the movie makers lifted the original video without credit, as I understand it.

Uncertainty may make you uncomfortable. Certainty makes you ridiculous.

Why not question something for a change?

Genetic Literacy Project
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