In this work, the adsorption energies and some of main electronic properties selected biological molecules adsorbed onto a (TiO2)20 cluster were studied. With aim, Density-Functional Theory (DFT) calculations performed using SIESTA code. The Perdew–Burke–Ernzerhof (PBE) functional within Generalized Gradient Approximation (GGA) was used for exchange correlation potential. For study, we chose wi...