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Get Answers to all your Questions
- #Cell Structure and Function
- #Medical
- #Class 11
- #National Eligilibility Cum Entrance Test
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- #Biology
Unit Membrane Model is also known as
Option: 1
Protein-Lipid-Lipid-Protein Model
Option: 2
Protein-Lipid-Protein-Lipid Model
Option: 3
Lipid-Lipid-Lipid-Protein Model
Option: 4
Protein-Protein-Lipid-Lipid Model
Answers (1)
The Plasma Membrane/Cell Membrane/Plasmalemma
- It is the outermost covering in the animal cells while it is present below the cell wall in fungal and plant cells.
- It is living, thin, delicate, semi-fluid protective covering that surrounds the cytoplasm.
The plasma membrane is composed of the following:
- Proteins (20 - 70%)
- Lipids (20 - 79%)
- Carbohydrates (1 - 5%)
- Enzymes (30 types)
- Water (20%
1. Structure of the plasma membrane
In order to explain the structure of the cell membrane, the following models were proposed:
b) Unit Membrane Model:
- It was proposed by Robertson in 1959.
- The model proposed that lipids and proteins are present as distinct layers.
- The membrane is asymmetrical because proteins on both sides of the membranes are different. Outer protein is called mucoid protein as it is associated with carbohydrates.
- Inner protein is called non-mucoid protein.
- This model is also known as P-L-L-P model.
- This model holds true for the membranes of organelles.
The Unit Membrane model of plasma membrane was proposed by Robertson in 1959. The model proposed that lipids and proteins are present as distinct layers. Outer protein is called mucoid protein as it is associated with carbohydrates. Inner protein is called nonmucoid protein. This model is also known as P-L-L-P model.
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