Question

question 1 know the function and composition of the cell membrane?

(this question is essential cell biology 4th edition chapter 11 )

Answer 1

The composition of cell membrane are

1. Phospholipids

2. Cholestrol

3. Protein

4. Carbohydrates

Fluid mosaic model describe the structure of cell membrane, it is not in solid and it is flexible and allow individual molecules are just floating in fluid-medium.

Phospholipids is the basic structure and has single phsopholipid molecules has two different ends, a head and a tail. Head is hydrophilic and tail is hydrophobic.

Cholesterol is made up of 4 rings of hydrogen and carbon . It maintain the consistency of cell membrane.

Protein is located on lipid bilayered called integral protein and peripheral protein are found either side of lipid bilayer , in side the cell it acts as enzymes and as receptors of specific molecule across the cell membrane.

Carbohydrates found outside the cell membrane attached to protein. They form glycocalyx it's function as to provide cushioning and protection for plasma membrane and important in cell membrane.

The main function of cell membrane are

• It forms a physical barrier
• It regulates exchange of material with it's surrounding
• Keep toxic substance outside the cell

-Contains receptors and chennel and allow specific molecule like ion, nutrients , waste product etc

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