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- #Biology
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- #Cell Structure and Function
Hugh Davson and James Danielli proposed
Option: 1
Fluid Mosaic Model
Option: 2
Unit Membrane Model
Option: 3
Sandwich/ Trilaminar Model
Option: 4
None of these
Answers (1)
The Plasma Membrane/Cell Membrane/Plasmalemma -
The Plasma Membrane/Cell Membrane/Plasmalemma
- It is the outermost covering in the animal cells while it is present below the cell wall in fungal and plant cells.
- It is living, thin, delicate, semi-fluid protective covering that surrounds the cytoplasm.
The plasma membrane is composed of the following:
- Proteins (20 - 70%)
- Lipids (20 - 79%)
- Carbohydrates (1 - 5%)
- Enzymes (30 types)
- Water (20%
1. Structure of the plasma membrane
In order to explain the structure of the cell membrane, the following models were proposed:
a) Sandwich/ Trilaminar Model:
- It was given by Hugh Davson and James Danielli in 1935.
- They proposed a sandwich model for the plasma membrane.
- According to them, the plasma membrane was composed of a lipid bilayer that was lined on both its inner and outer surface by a layer of globular proteins.
- They revised their model in the early 1950s to provide reasons for the selective permeability.
- They further modified the sandwich structure to have proteins within the lipid bilayer that acted as a conduit for transport.
-
Hugh Davson and James Danielli proposed the Sandwich or Trilaminar model for the structure of plasma membrane. According to them, the plasma membrane was composed of a lipid bilayer that was lined on both its inner and outer surface by a layer of globular proteins.
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