In her $${}1981$$ book, *Symbiosis in Cell Evolution*, Lynn Margulis expanded on the initial endosymbiotic theory after it gained wide acceptance. In this work, she explained how endosymbiosis acts as a major driving factor in the evolution of organisms.

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American geneticist Lynn Margulis ($${}1938$$–$${}2011$$) published her ideas regarding the endosymbiotic hypothesis of the origins of mitochondria and chloroplasts in $${}1967$$. Benefiting from advances in microscopy that allowed scientists to differentiate prokaryotic from eukaryotic cells, Margulis reviewed the literature and argued that these eukaryotic organelles are of prokaryotic origin. To support her claims, she presented a growing body of microscopic, genetic, molecular biology, fossil, and geological data.

Lynn Margulis

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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