These are large, two-dimensional assemblies of phospholipids from tail to tail. This makes up  the main fluid mosaic model of cellular membranes within the organism. These sheets may also form lipid-bilayer spheres that are the structural basis of vesicles and liposomes,. 

University of Southern Mississippi

The amphipathic nature of phospholipids enables them to form uniquely functional structures in aqueous environments. These structures include:

- Micelles
- Lipid bilayer sheets (unit membranes)

Unique Phospholipid Structures 

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

These are spherical shaped assemblies containing a hydrophobic interior of phospholipid tails and an hydrophilic exterior of polar head groups.

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