| Summary: | Considering the importance of knowledge about science and how they help for an active and responsible participation in today's society, this study aimed to verify the prior and subsequent knowledge of the didactic proposal on the subject of hair, evaluating the understanding of concepts related to proteins, amino acids and oxidation-reduction reactions. Twenty-seven students from the 5th semester of the Licentiate Degree in Natural Sciences participated in this research. The didactic proposal was applied using an expository class and a demonstrative experiment, and evaluated through a questionnaire before and after the proposal. In the result of this study, it was detected that students had difficulties with specific concepts of proteins, which was demonstrated by the lack of clarity in the development of responses. However, when questioned through chemical concepts related to daily life, satisfactory results were obtained. Finally, part of this work corroborates the effectiveness of thematic activities combined with everyday issues, confirming data already present in the literature. However, more studies are needed to meet the demand for understanding scientific concepts of biochemistry, since, in this context, the present proposal has not demonstrated its effectiveness in its entirety.
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