This chapter overviews and discusses an emerging area of quantum biology.The chapter provides examples of multiscale biophysical phenomena in which quantum mechanics (QM) plays a crucial role. Among others, the chapter discusses case studies of quantum processes present in real biological systems, such as photoabsorption electron transfer, proton-coupled electron transfer and spin chemistry. For all the case studies, both a quick rundown of the theory behind each example is provided accompanied with real-life applications. Finally, ideas and possibilities where the knowledge from quantum effects in biological systems may stimulate advances in novel devices for diverse applications on the nanoscale, are provided.