What was the unit membrane model?

Correct answer: A. Plasma membrane has lipid bilayer

  • A. Plasma membrane has lipid bilayer
  • B. Proteins are embedded in the lipid bilayer
  • C. Plasma membrane has charged pores for transport of materials which cannot penetrate through the lipid bilayer
  • D. All of the above

Explanation

The unit membrane model was a proposed model of the structure of all cellular membranes. It was first proposed in 1935 by Hugh Davson and James Danielli. The model proposed that all cellular membranes are composed of a bilayer of phospholipids, with proteins sandwiched between the two layers of phospholipids.

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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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