While bacteriophages inject their nucleic acid directly into the host cell, leaving the viral capsid outside, animal viruses enter host cells entirely through either receptor-mediated endocytosis or membrane fusion.

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Penetration is the second stage of the lytic cycle, where the bacteriophage contracts its tail sheath like a hypodermic needle to inject its viral genome through the host cell wall and membrane, while the phage head and other components remain outside the cell.

Penetration of Bacteriophage (Lytic Mechanism)

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.

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