The structure of plasma membrane fluid mosaic model is proposed bya)Gramb)Singer and Nicolsonc)Schwann and Schleidend)Robert brownCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

An improved model of the structure of cell membrane was proposed by S.J. Singer and G.L. Nicolson (1972) widely accepted as fluid mosaic model.CORRECT OPTION IS B.

Answer

Fluid mosaic model of plasma membrane was given by S J Singer and G S Nicolson (1972).

According to this model, plasma membrane has two layers (bilayer) of phospholipids and two types of proteins; intrinsic and extrinsic proteins. The permeability of the plasma membrane is controlled by the intrinsic proteins.

Answer

The fluid mosaic model explains various observations regarding the structure of functional cell membranes. According to this model, there is a lipid bilayer in which the protein molecules are embedded. ...Fluid mosaic model is proposed by SJ Singer and G Nicolson in 1972. Its main function is to give shape to the cell.

Answer

The Fluid Mosaic Model of Plasma Membrane
The Fluid Mosaic Model of the plasma membrane was proposed by Singer and Nicolson in 1972. It describes the structure of the plasma membrane as a fluid lipid bilayer with embedded proteins that form a mosaic pattern.

Fluidity of the Membrane
According to this model, the plasma membrane is composed of a double layer of phospholipid molecules with proteins scattered throughout. The lipid bilayer is fluid, meaning that the molecules can move laterally within the membrane.

Mosaic Pattern
The proteins within the membrane are arranged in a mosaic pattern, with some proteins spanning the entire bilayer (integral proteins) and others only attached to one side (peripheral proteins). These proteins play a crucial role in various cellular functions such as cell signaling and transport.

Role of Cholesterol
Cholesterol molecules are also present in the plasma membrane and help regulate its fluidity. They insert themselves between the phospholipid molecules, reducing the mobility of the lipid bilayer and making it more stable.

Importance of the Model
The Fluid Mosaic Model of the plasma membrane revolutionized our understanding of cell biology. It explains how the membrane is selectively permeable, allowing certain molecules to pass through while blocking others. This model has been supported by various experimental evidence and is widely accepted in the scientific community.

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