BIOMEMBRANES
Q. 1 Fluid mosaic model was proposed by-
| A |
Singer and Nicolson |
|
| B |
David Robertson |
|
| C |
Meselson and Sahli |
|
| D |
Robert Darwin |
Q. 1
Fluid mosaic model was proposed by-
| A |
Singer and Nicolson |
|
| B |
David Robertson |
|
| C |
Meselson and Sahli |
|
| D |
Robert Darwin |
Ans.
A
B
Explanation:
- The lipid bilayer was originally proposed by Davson and Danielle in 1935. Later, the structure of the biomembranes was described as a fluid mosaic model (Singer and Nicolson, 1972).
- The phospholipids are arranged in bilayers with the polar head groups oriented towards the extracellular side and the cytoplasmic side with a hydrophobic core.
- Each leaflet is 25 Å thick, with the head portion 10 Å and tail 15 Å thick. The total thickness is about 50 to 80 Å.
- The lipid bilayer shows the free lateral movement of its components, hence the membrane is said to be fluid in nature. Fluidity enables the membrane to perform endocytosis and exocytosis.
Q. 2
The model that is now known to be correct for the structure of biological membrane is
| A |
Page’s model |
|
| B |
Fluid mosaic model |
|
| C |
Lac Operon model |
|
| D |
Lock and key model |
Ans.
Explanation:
- The lipid bilayer was originally proposed by Davson and Danielle in 1935. Later, the structure of the biomembranes was described as a fluid mosaic model (Singer and Nicolson, 1972).
- The phospholipids are arranged in bilayers with the polar head groups oriented towards the extracellular side and the cytoplasmic side with a hydrophobic core.
- Each leaflet is 25 Å thick, with the head portion 10 Å and tail 15 Å thick. The total thickness is about 50 to 80 Å.
- The lipid bilayer shows the free lateral movement of its components, hence the membrane is said to be fluid in nature. Fluidity enables the membrane to perform endocytosis and exocytosis.
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