/sci/ - Science & Math

>>14815087
The RNA doesn't 'know' to do anything, it does what it does as a function of it's structure. What decides whether it does its thing is whether it's present in a cell (or a region of a cell) and whether or not it's sequestered by interactions with some other RNA or some protein.
I get what you're saying, but the retarded and dismissive replies of other anons do have a kernel of truth in them. There's no blueprint, because this all is not appearing from scratch; it's part of a long, evolutionary process. Parts of the signalling pathways used in making this all work are extremely conserved - you see the same pathways and the same specific types of interactions between different motifs used for all sorts of different purposes in cellular regulation, because the bafflingly complex processes we see today are the results of these different pathways being repeatedly tweaked and gradually coopted to different purposes. So, the process by which your neurons 'know' to grow axons in one specific direction is remarkably similar to the way that yeast cells 'know' where to grow mating projections.