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According to fluid mosaic model (proposed by Singer & Nicolson) plasma membrane is composed of :–
- a)Cellulose, hemicellulose
- b)Phospholipid and integrated protein
- c)Phospholipid, extrinsic protein, intrinsic protein
- d)Phospholipid and hemicellulose
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
According to fluid mosaic model (proposed by Singer & Nicolson) pl...
The fluid mosaic model of the biomembrane or cell membrane was proposed by SJ Singer and GL Nicolson in the year 1972.
According to this model, the transmembrane proteins are embedded within the phospholipid bilayer.
Transmembrane proteins are of two types-
Extrinsic membrane proteins- are present outside the membrane which bound to the lipid layer by weak molecular forces.
Intrinsic membrane proteins- are completely embedded in the membrane.
So, the correct answer is 'Phospholipids, extrinsic proteins and intrinsic proteins'. option C
According to this model, the transmembrane proteins are embedded within the phospholipid bilayer.
Transmembrane proteins are of two types-
Extrinsic membrane proteins- are present outside the membrane which bound to the lipid layer by weak molecular forces.
Intrinsic membrane proteins- are completely embedded in the membrane.
So, the correct answer is 'Phospholipids, extrinsic proteins and intrinsic proteins'. option C
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According to fluid mosaic model (proposed by Singer & Nicolson) pl...
Composition of Plasma Membrane according to Fluid Mosaic Model:
Plasma membrane, according to the fluid mosaic model proposed by Singer & Nicolson, is composed of a combination of different molecules that give it a fluid nature. The main components of the plasma membrane are as follows:
Phospholipids:
- Phospholipids are the most abundant molecules in the plasma membrane. They form a lipid bilayer that acts as a barrier to the passage of hydrophilic molecules.
- The hydrophilic head of the phospholipid faces the outer and inner aqueous environments, while the hydrophobic tails face each other in the middle of the bilayer.
Extrinsic Proteins:
- Extrinsic proteins are located on the surface of the membrane, either on the inner or outer side.
- These proteins do not penetrate the lipid bilayer but are attached to it through weak interactions.
Intrinsic Proteins:
- Intrinsic proteins, also known as integral proteins, are embedded within the lipid bilayer.
- They can span the entire width of the membrane and have hydrophobic regions that interact with the lipid tails.
Key Points:
- The plasma membrane is composed of phospholipids, extrinsic proteins, and intrinsic proteins according to the fluid mosaic model.
- Phospholipids form a lipid bilayer that provides the structural framework of the membrane.
- Extrinsic proteins are located on the surface of the membrane, while intrinsic proteins are embedded within the lipid bilayer.
In conclusion, the plasma membrane is a complex structure composed of phospholipids, extrinsic proteins, and intrinsic proteins, as per the fluid mosaic model proposed by Singer & Nicolson. Each component plays a crucial role in maintaining the integrity and function of the membrane.
Plasma membrane, according to the fluid mosaic model proposed by Singer & Nicolson, is composed of a combination of different molecules that give it a fluid nature. The main components of the plasma membrane are as follows:
Phospholipids:
- Phospholipids are the most abundant molecules in the plasma membrane. They form a lipid bilayer that acts as a barrier to the passage of hydrophilic molecules.
- The hydrophilic head of the phospholipid faces the outer and inner aqueous environments, while the hydrophobic tails face each other in the middle of the bilayer.
Extrinsic Proteins:
- Extrinsic proteins are located on the surface of the membrane, either on the inner or outer side.
- These proteins do not penetrate the lipid bilayer but are attached to it through weak interactions.
Intrinsic Proteins:
- Intrinsic proteins, also known as integral proteins, are embedded within the lipid bilayer.
- They can span the entire width of the membrane and have hydrophobic regions that interact with the lipid tails.
Key Points:
- The plasma membrane is composed of phospholipids, extrinsic proteins, and intrinsic proteins according to the fluid mosaic model.
- Phospholipids form a lipid bilayer that provides the structural framework of the membrane.
- Extrinsic proteins are located on the surface of the membrane, while intrinsic proteins are embedded within the lipid bilayer.
In conclusion, the plasma membrane is a complex structure composed of phospholipids, extrinsic proteins, and intrinsic proteins, as per the fluid mosaic model proposed by Singer & Nicolson. Each component plays a crucial role in maintaining the integrity and function of the membrane.
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According to fluid mosaic model (proposed by Singer & Nicolson) plasma membrane is composed of :–a)Cellulose, hemicelluloseb)Phospholipid and integrated proteinc)Phospholipid, extrinsic protein, intrinsic proteind)Phospholipid and hemicelluloseCorrect answer is option 'C'. Can you explain this answer?
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