Although cells were first observed by Robert Hooke in the 1660s, cell theory was not widely accepted in the scientific community for approximately 200 years. The subsequent work and observations of scientists like Matthias Schleiden, Theodor Schwann, Robert Remak, and Rudolf Virchow were critical in establishing its general acceptance.

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Developed in the 17th century following early observations of microscopic life, the cell theory is a foundational scientific principle. It posits three main claims: the cell is the fundamental unit of life, all living organisms contain at least one cell, and new cells can only arise from pre-existing cells.

Cell Theory

https://openstax.org/details/books/microbiology/

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.

OpenStax Microbiology Textbook

The principle of biogenesis is a basic tenet of modern cell theory which states that all cells only come from other cells.

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