The nuclear membrane, also known as the nuclear envelope, has two connected lipid bilayers to contain the nucleus. It contains pores that allow passage of materials through the membrane. 

University of Wisconsin - Madison

The nucleus is a defining characteristic of eukaryotes. The nucleus has a nuclear membrane that contains the DNA genome of a eukaryotic cell.The DNA is organized in the nucleus because it is condensed with histone proteins.

Nucleus

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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