Without enzymes there is no life, the reactions would take too long. And of course, oned of the big mysteries of oringin of life, is how did it start without enzymes, which are generally monster molecules in size.:-"Take enzymes. These are the workhorses of the living world, speeding up chemical reactions so that processes that would otherwise take thousands of years happen inside living cells in seconds. How they achieve this speed-up - often more than a trillion-fold - has long been an enigma. But now, research by Judith Klinman at the University of California, Berkeley and Nigel Scrutton at the University of Manchester (among others) has shown that enzymes can employ a weird quantum trick called tunnelling. Simply put, the enzyme encourages a process whereby electrons and protons vanish from one position in a biochemical and instantly rematerialise in another, without visiting any of the in-between places - a kind of teleportation.
 
"This is pretty fundamental stuff. Enzymes made every single biomolecule in every cell of every living creature on the planet. They are, more than any other component (even DNA, given that some cells get by without it) the essential ingredient of life. And they dip into the quantum world to help keep us alive."-http://aeon.co/magazine/science/quantum-biology-the-uncanny-order-of-life/-Read the whole article. Quantum effects are everywhere in life:-"Beneath all these quantum solutions to puzzling vital phenomena, we find ourselves with a deeper mystery. Quantum coherence is an immensely delicate phenomenon, depending on those in-tune particle waves. To maintain it, physicists usually have to enclose their systems within near-perfect vacuums and cool them down to very close to absolute zero temperature to freeze out any heat-driven molecular motion. Molecular vibrations are the mortal enemy of quantum coherence. How, then, does life manage to maintain its molecular order for long enough to perform its quantum tricks in warm and wet cells? That remains a profound riddle. Recent research offers a tantalising hint that, instead of avoiding molecular storms, life embraces them, rather like the captain of a ship who harnesses turbulent gusts and squalls to maintain his ship upright and on-course. As Schrödinger predicted, life navigates a narrow stream between the classical and quantum worlds: the quantum edge."