In this study, it was aimed to examine the visual content and expressions in the texts in the "Cell Divisions" unit in the 10th Grade Biology textbook of the Ministry of National Education, Secondary Science High School, taught in the 2022-2023 academic year, in terms of scientific content. The data sources of the research, in which the case study design and document analysis data collection technique, which are among the qualitative research designs, are used, constitute the relevant textbook. National and international reference books were used to evaluate the scientific conformity of the expressions and images in the texts in the relevant unit in the textbook, which was examined by descriptive analysis by three field experts in Biology and Science. According to the results of the research, it was determined that the scientific content of the texts and images in the "Cell Divisions" unit in the MoNE Secondary Science High School 10th Grade Biology textbook could not be created in full compliance with the required qualifications, and there were missing, incorrect expressions and representations. Since this situation will cause wrong learning and misconceptions in students, it is recommended to rearrange the relevant texts and visuals.