Unit membrane model of plasmamembrane was proposed by:-a)Robertsonb)Singerc)Daniellid)Robert HookCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Answer

Robertson proposed unit membrane concept for biological membranes. According to this concept, the biological membrane is a lipid bilayer surrounded on either side by proteins with a difference in their type for the outer and inner side.

Answer

A) Robertson proposed unit membrane model of plasmamembrane.
b) Singer and Nicholson-- Fluid mosaic model
c) Danielle and Dawson --- Sandwiched model.
d) Robert Hook discovered the cell.

I think this much is enough for neet level.
This is memory based, no explanation is needed I think.

Answer

The correct answer is option 'A' - Robertson.

The unit membrane model of the plasma membrane was proposed by G. E. Robertson in 1959. This model is also known as the 'fluid mosaic model' and is widely accepted as the current model for the structure of the plasma membrane.

Explanation:
The unit membrane model describes the plasma membrane as a phospholipid bilayer with embedded proteins. It suggests that the membrane is composed of a double layer of phospholipids, with the hydrophilic (water-loving) heads facing outward towards the aqueous environment and the hydrophobic (water-fearing) tails facing inward, creating a barrier that separates the inside of the cell from the outside.

Key points of the unit membrane model:

1. Phospholipid Bilayer:
- The main component of the plasma membrane is a double layer of phospholipids, with the hydrophilic heads facing outward and the hydrophobic tails facing inward.
- The hydrophilic heads interact with the aqueous environment both inside and outside the cell, while the hydrophobic tails interact with each other in the interior of the bilayer, creating a stable structure.

2. Proteins:
- The phospholipid bilayer is interspersed with various proteins that are embedded within the membrane.
- These proteins can span the entire thickness of the membrane (transmembrane proteins) or be partially embedded in one side of the membrane (peripheral proteins).
- Proteins in the plasma membrane have various functions, including transport of molecules, cell signaling, and structural support.

3. Fluidity:
- The unit membrane model also emphasizes the fluid nature of the plasma membrane.
- The phospholipids in the bilayer are not rigidly fixed in place but can move laterally within the plane of the membrane.
- This fluidity allows for the movement of proteins and other molecules within the membrane, facilitating various cellular processes.

In conclusion, the unit membrane model of the plasma membrane, proposed by Robertson, describes the membrane as a phospholipid bilayer with embedded proteins. This model highlights the fluid nature of the membrane and has been widely accepted as the current understanding of the plasma membrane structure.

Answer

Robertson proposed unit membrane concept for biological membranes. According to this concept, the biological membrane is a lipid bilayer surrounded on either side by proteins with a difference in their type for the outer and inner side. All biomembranes have a trilaminar structure with an electron transparent lipid bilayer (35A˚) lying sandwiched between electron dense protein layers (20A˚ each).

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