Question

Fluid Mosaic model proposed by singer and Nicolson
replaced Sandwich model proposed by Danielli and
Davson. Why?​

Answer 1

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According to bimolecular model of Danielli and Davson, plasma membrane consistes of 2 layers of phospholipid molecules in which hydrophilic heads face outside and hydrophobic non-polar lipid chains face inside. The plasma membrane would thus consist of a double layer of phospholipid molecules sandwiched between 2 continuous layers of protein. The fluid mosaic model describes the plasma membrane structure as a mosaic of phospholipids, cholesterol, proteins & carbohydrates. The model has evolved over time and best explains the fluid nature due to lipids, and accounts for the structure and functions of the plasma membrane

Answer 2

Explanation:

According to bimolecular model of Danielli and Davson, plasma membrane consistes of 2 layers of phospholipid molecules in which hydrophilic heads face outside and hydrophobic non-polar lipid chains face inside. The plasma membrane would thus consist of a double layer of phospholipid molecules sandwiched between 2 continuous layers of protein. The fluid mosaic model describes the plasma membrane structure as a mosaic of phospholipids, cholesterol, proteins & carbohydrates. The model has evolved over time and best explains the fluid nature due to lipids, and accounts for the structure and functions of the plasma membrane