Until recently, biology and physics rarely crossed paths. Recent technological progress suggests that quantum coherence or other quantum effects may be harnessed by a variety of biological systems.
Every chemical process relies on quantum mechanics. And yet, in many ways, quantum mechanics is still a concept alien to biology, especially on scales that can have a physiological impact. After all, how could a set of differential equations describe something as complex as a living organism?
Further details: Quantum mechanics' role in biology