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Q.20 What is triple fusion? Where does it occur?
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Q.20 What is triple fusion? Where does it occur? Long Answer Type Questions: - Q.21 Explainthestagesinvolvedinthematurationofamic Q.22 Draw a labelled diagram of the sectional view

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Uploaded on: 1/31/2023

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Plasma Membrane or Cell Membrane of a cell with the outside world. The detailed structure of the membrane was studied only after the invention Plasma membrane is an absolute requirement for all living organisms as it is responsible for the relationship of electron microscope in the 1950s. Meanwhile, chemical studies on the cell membrane enabled the scientists to deduce the possible structure of the plasma membrane. The chemical studies done especially on the human red blood cells (RBCs), enabled the scientists to deduce the possible structure of plasma membrane On the basis of these studies, scientists found that the cell membrane is composed of lipids that are arranged in a bilayer. These lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophobic (non-polar) tails towards the inner sides. The polar ends (head) interact with water and are called hydrophilic. This ensures that the non-polar tall of saturated hydrocarbons or hydrophobic tail is protected from the aqueous environment. Later, biochemical investigation clearly revealed that the cell membranes also possess protein and carbohydrate. The ratio of protein and lipid varies considerably in different cell types. In human beings, the membrane of the erythrocyte (RBC) has approximately 52 percent protein and 40 percent lipids. Depending on the ease of extraction, membrane proteins can be classified as integral or peripheral. The peripheral proteins lie on the surface of the membrane while the integral proteins are partially or totally buried in the membrane. The integral proteins which run throughout lipid bilayer are known as tunnel proteins (Trans membrane proteins). These proteins cannot be removed easily and their removal requires crude methods of treatment like detergents. Thus, the membrane has been described as Protein icebergs floating in sea of phospholipids. An improved model of the structure of cell membrane was proposed by Singer and Nicolson (1972) widely accepted as Fluid Mosaic Model. Sugar Protein bf x 5% Cholesterol feegral protein 000 Lipid bilayer 28 Fig.: Fluid mosaic model of plasma membrane Corporate Office: Aakash Tower, 8, Pusa Road, New Delhi-110005. Phone: 011-47623456
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Question Text
Q.20 What is triple fusion? Where does it occur? Long Answer Type Questions: - Q.21 Explainthestagesinvolvedinthematurationofamic Q.22 Draw a labelled diagram of the sectional view
Updated OnJan 31, 2023
TopicCell: Structure and Functions
SubjectBiology
ClassClass 11
Answer Type Video solution: 1
Upvotes64
Avg. Video Duration2 min