Random is the basis of Brownian motion. Increases in temp. cause increases in entropy, causes increases in random collisions, or increased reaction rate. Biological systems operate in a very narrow temperature range, the probability of a "reaction" is not based on simple "Normal or Poission" probability distributions. They are stepped Markovian chains, usually involving a catalyst or enzyme. The probability is not the calculation of the combinations. The amount of "information" contained in each progressive step of the electron and molecular configurations of the reactants "communicates" the direction of the next step. The order of complexity of the protein is similar to the string. How many twists or knots it has in it, determines the order. Interestingly they are polynomials and if you are interested, there is a field of Math called "Knot Theory" that looks at these problems.
rte post is outstanding and the part of Molecular Biology is the most important especially from the point of Molecular Evolution. (a good book if your interested,, by Wen-Hsiang Li)
GMO foods are a good example. Modification of the plants protective layer against insects, to increase overall food supply.
Currently genetic modifications in humans is restricted, but going on in animals at different levels. Some countries are no doubt doing it on humans. You think they care about your creationist, neo-darwinism, old darwinism, evolutionist hangups.
