Question

Fluid mosaic model of cell membrane was put forward by
A) Danielli and Davson
B) Singer and Nicolson
C) Garner and Allard
D) Watson and Crick

Answer 1

The cell membrane or the plasma membrane is the outermost layer present in an animal cell which separates the inside of a cell from the outer environment.

Complete answer:
Before we find the correct answer, let us find a little bit more about cell membrane. The cell membrane is a semipermeable membrane and is made up of proteins and lipids.

Option A: Danielli and Davson gave the pauci molecular model of plasma membrane and not fluid mosaic model. Therefore, this is the incorrect option.
Option B: Singer and Nicolson gave the fluid mosaic model of plasma membrane. Therefore, this is the correct option. As per this model, the cell membrane is made up of carbohydrates, phospholipids, proteins and cholesterol. The plasma membrane is present as a bilayer and the phospholipids have two parts.
Head- It is hydrophilic and it pointed outwards
Tail - It is a hydrophobic and is pointed inwards
Option C: Garner and Allard studied photoperiodism and not fluid mosaic model. Therefore, this is the incorrect option.
Option D: Watson and Crick gave the double helix model of DNA and not fluid mosaic model. Therefore, this is the incorrect option.

Thus, the correct option is (B) Singer and Nicolson.

Note: The functions of cell membrane are,

It acts as a selectively permeable membrane.
It provides support and maintains the shape of the cell.
It regulates cell growth.