In this paper, several teaching experiences for understanding the structure and function of prokaryotic and eukaryotic cells are described. These experiences were carried out in courses for ecology students. Applying the Seminar model, it’s important to use the traverse axes, to confront preconcepts, the employment of “mentefacts” (mindframes) and conceptual maps; as the ones proposed by the constructivism and the conceptual pedagogy, which contribute to the motivation and articulation of conceptual structures. The workshops and the type of evaluation enforce the construction of social interaction, cooperative learning, and a better understanding of the thinking strategies. The laboratory work and undergraduate research allow the application of cellular Biology concepts in the analysis of environmental problems.