The $$S$$ phase is the second stage of interphase in the eukaryotic cell cycle, during which DNA synthesis and replication occur.

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Interphase is the phase of the cell cycle during which the cell does not divide, but instead undergoes normal growth processes and replicates its DNA in preparation for cell division.

Interphase

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 $$G_1$$ phase is the first stage of interphase in the eukaryotic cell cycle, characterized by normal cell growth.

G1 Phase

S Phase

The $$G_2$$ phase is the third stage of interphase in the eukaryotic cell cycle, during which the cell undergoes further growth to prepare for division.

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