The objective of this course is to study potential interactions between biology and engineering. It is divided into 3 parts as follows: The first part is dedicated to elementary biology to answer the following questions: what is a cell? What are the different types of cells? What biological mechanisms take place in living systems? The second part is an introduction to bio-informatics. We will for instance show how the study of DNA sequences combined with a simple evolution model can lead to the retrieval of the evolution tree of a given set of species, or how similarities between two proteins can lead to the same functionality. Finally, the course will illustrate interactions between biology (living systems) and engineering: