Cell complexity: phospholipids (Introduction)

by David Turell , Tuesday, October 07, 2014, 15:29 (3482 days ago) @ David Turell

Carry proteins across cell walls, but do more than that:-http://phys.org/news/2014-10-reveals-messenger-molecules-cell-walls.html-"Researchers focused on messengers called signaling phospholipids that act like bellhops in cell walls, escorting proteins to compartments within a cell and activating their functions. The results could explain why these messengers had been observed linked to proteins in the nucleus of cells; their purpose there had been a mystery.
 
"X-ray crystallography at SLAC's Stanford Synchrotron Radiation Lightsource, a DOE Office of Science User Facility, provided the first detailed look at how this messenger acts as a hormone in binding to a specialized hormone-sensing protein called a nuclear receptor."-In the cell each special molecule has an assigned job. Cells are factories, and they rely on the specialization of these molecules. But each molecule can have any number of 3-D shapes and parts. How did evolution find exactly the right ones to fit together? If evolution had to search for the 'right' form of each functional molecule out of millions of possibilities, how did evolution find the right ones in the time available. And evolution works by chance?