The latest model for plasma membrane is called the:
Correct answer: C. Fluid mosaic model
- A. Lamellar model
- B. Unit membrane model
- C. Fluid mosaic model
- D. Molecular lipid model
Explanation
The fluid mosaic model is the most widely accepted and current model for the plasma membrane. In 1972, S.J. Singer and G.L. Nicolson proposed this model. According to this model, the plasma membrane consists of a phospholipid bilayer with embedded proteins. The lipid bilayer is fluid, meaning the individual lipid molecules can move laterally within the membrane. The proteins are not static but form a dynamic mosaic pattern floating within the lipid bilayer. The fluidity and mosaic arrangement of lipids and proteins in the membrane allow various functions, such as cell signaling, transport, and maintaining cell structure.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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