Which of the following is an accurate description of the phospholipid bilayer in cell membranes? a)It is made up of two layers of phospholipid polymers. b) It is made up of two layers of phospholipid molecules with the tails pointing away from each other. c) It is made up of two layers of phospholipid molecules with the tails lying parallel to each other. d) It is made up of two layers
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molecules with the tails interacting with each other.
I'm not sure whether this will answer your question, but it is good to realize that in general our idea of cell membranes as once proposed by Singer & Nicolson (Singer & Nicolson, 1972) is nowadays way more complex than anticipated ever before (see for excellent reviews elsewhere (Bernardino et al., 2016; Sezgin et al., 2017).
Bernardino de la Serna, B. J., Schütz, G. J., Eggeling, C., and Cebecauer, M. (2016). There is no simple model of the plasma membrane organization. Front. Cell Dev. Biol. 4: 106.
Sezgin, E., Levental, I., Mayor, S., and Eggeling, C. (2017). The mystery of membrane organization: composition, regulation and roles of lipid rafts. Nat. Rev. Mol. Cell Biol. 18, 361-374.
Singer, S. J., and Nicolson, G. L. (1972) The fluid mosaic model of the structure of cell membranes. Science 175, 720–731.
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