The main objective of this curricular unit is for students to understand the bases of biological organization and the central role that the molecule that contains the genetic information has in these processes: how the information needed to build and maintain an organism is encoded in the genome, how this information is expressed during the different processes that lead to biological organization; and how different intrinsic and environmental factors contribute to the regulation of genetic expression. It is also fundamental to understand not only the need to maintain the stability of genetic information but also how this information is changed over time in normal and sometimes in dysfunctional situations, such as in tumor cells. Students will also become familiar with approaches and methodologies used in molecular biology, with a special focus on the ones used for DNA, RNA and protein sequence, as well gene expression analysis.