Question:

In fluid mosaic model of plasma membrane

Updated On: Mar 28, 2024
  • Upper layer is non-polar and hydrophilic
  • Polar layer is hydrophobic
  • Phospholipids form a bimolecular layer in middle part
  • Proteins form a middle layer
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The Correct Option is C

Solution and Explanation

The correct option is (C) : Phospholipids form a bimolecular layer in middle part

Singer and Nicolson suggested a concept of the plasma membrane as a fluid mosaic. This hypothesis proposes that the plasma membrane is a bilayer of phospholipids that contains proteins, cholesterol, and carbohydrates, giving it a mosaic-like look. The hydrophilic and polar heads of the lipid molecules are placed on the outside of the phospholipid bilayer, while the hydrophobic and non-polar tails are positioned on the inside.

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Cells are the basic building blocks of all living organisms. They can be classified into two main types: prokaryotic and eukaryotic.

  1. Prokaryotic cells: These are simple, single-celled organisms that lack a true nucleus and other membrane-bound organelles. They have a simple cell wall and are usually smaller in size than eukaryotic cells. Examples of prokaryotic cells include bacteria and archaea.
  2. Eukaryotic cells: These are complex, multicellular organisms that have a true nucleus and various membrane-bound organelles. They are typically larger in size than prokaryotic cells and can be found in plants, animals, fungi, and protists. Eukaryotic cells can be further classified into different types based on their structure and function, including:
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  • Plant cells: These are eukaryotic cells found in plants. They have a rigid cell wall made of cellulose and contain chloroplasts for photosynthesis. Plant cells also contain various organelles, including mitochondria, ribosomes, and a nucleus.
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Understanding the different types of cells is important for understanding their structure, function, and role in various biological processes.