" Enzymes have made and unmade every single biomolecule inside every living cell that lives or has ever lived. Enzymes are as close as anything to the vital factors of life. So the discovery that some, and possibly all, enzymes work by promoting the dematerialization of particles from one point in space and their instantaneous materialization in another provides us with a novel insight into the mystery of life. And while there remain many unresolved issues related to enzymes that need to be better understood, such as the role of protein motions, there is no doubt that quantum tunneling plays a role in the way they work. Even so, we should address a criticism made by many scientists who accept the findings of Klinman, Scrutton and others, but nevertheless claim that quantum effects have as relevant a role in biology as they have in the workings of a steam train: they are always there but are largely irrelevant to understanding how either system works. Their argument is often positioned within a debate about whether or not enzymes evolved to take advantage of quantum phenomena such as tunneling. The "

― Johnjoe McFadden , Life on the Edge: The Coming of Age of Quantum Biology