Structure and behaviour to co-exist

This, I think, was one of the more interesting quotes I've read for months:

OO, UML, ROOM and RRT make a fundamental distinction between structural modeling and behavioral modeling of computer systems. Feitelson and Treinin suggest a biological parallel when they state that “the particulars of many cellular structures seem not to be encoded in DNA, and they are never created from scratch; rather, each cell inherits templates for these structures from its parent cell.” Some cellular structure (a hierarchy of cell and organelle compartments with collections of small molecules) must exist before the DNA-encoded enzymes and other proteins can carry out their behavioral work.

( In Webb K., White T. UML as a cell and biochemistry modeling language )