This paper has arisen as a result of teaching Models in Biology to undergraduates of Bioengineering at the Gediminas Technical University of Vilnius. The aim was to teach the students to use a fresh approach to the problems they are familiar with, to come up with an articulate verbal model after a mental effort, to express it in rigorous mathematical terms, to solve (with the aid of computers) corresponding equations, and, finally, to analyze and interpret experimental data in terms of their (mathematical) models. Investigation of microbial growth provides excellent possibilities to combine laboratory exercises, mathematical modelling and model-based data analysis. Application of mathematics in this field proved to be very fruitful in getting a deeper insight into the processes of microbial growth. The step-by-step modelling resulted in an extended model of the growth covering conventional “lag”, “exponential” and “stationary” phases. In contrast to the known models (differential equations which can be solved only numerically), the present model is expressed symbolically as a finite combination of elementary functions. The approach can be applied in other areas of modern biology.

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