Aspects of this topic are discussed in the following places at Britannica.
...and proteins. About one-fourth of the lipid portion of the lamellae consists of pigments and coenzymes; the remainder consists of various lipids, including polar compounds such as phospholipids and galactolipids. These polar lipid molecules have “head” groups that attract water (i.e., are hydrophilic) and fatty acid “tails” that are oil soluble and repel water...
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