Os livros didáticos são os instrumentos de ensino mais acessíveis aos professores nas escolas, sendo primordial que os conteúdos possam ser contemplados da forma mais ampla possível. O tema arqueas, merece ser pontuado nesses materiais, especialmente pelos recentes avanços tecnológicos que possibilitam o emprego de tais micro-organismos em diversas áreas. Neste sentido, foram analisadas oito obras didáticas de Biologia do Ensino Médio segundo os aspectos gerais de Coerência e Conceitos, Quantificação e Interdisciplinaridade e Contextualização das bactérias extremófilas, tendo por base o guia do Programa Nacional do Livro Didático do Ministério da Educação. Os critérios "aplicações biotecnológicas e adaptações bioquímicas" foram os que apresentam as maiores defasagens em relação à abordagem do assunto, na maioria das obras didáticas. No geral, somente uma obra teve boa avaliação em todos os aspectos analisados. Quanto ao critério "coerência entre fundamentação teórica e, imagens, textos e exercícios propostos", todas as obras apresentaram-se satisfatórias. Portanto, apesar de as discussões sobre esse tema serem de suma importância ao contexto atual, as obras apresentam deficiências técnicas, em especial no que tange às aplicações biotecnológicas.Palavras-chave: Archaea, ensino de microbiologia, procariontes extremófilos.Textbooks are the most accessible teaching tools for teachers in schools, and it is essential that the contents can be contemplated in the widest possible way. The subject archaea deserves to be punctuated in these materials, especially by the recent technological advances that allow the use of such microorganisms in several areas. In this sense, eight didactic works of Teaching Biology were analyzed according to the general aspects of Coherence and Concepts, Quantification and Interdisciplinarity and Contextualization of the extremophilic bacteria, based on the guide of the National Program of Didactic Book of the Ministry of Education. The criteria "biotechnological applications and biochemical adaptations" were the ones with the greatest lags in relation to the subject approach in most didactic works. In general, only one work had good evaluation in all aspects analyzed. As to the criterion "coherence between theoretical foundation and images, texts and proposed exercises", all works were satisfactory. Therefore, although the discussions on this subject are of the utmost importance to the current context, the works present technical deficiencies, especially in what concerns the biotechnological applications.
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