#Fluid mosaic model of cell membrane download

Lipids, however, are the main component of membranes. Thus a lipid bilayer containing embedded and peripheral proteins consists of the plasma membrane. The basic architecture of all cell membranes with membrane proteins is given by a bilayer of phospholipids about 3 nm thick, giving each cell membrane its own specific set of functions. The combined evidence from electron microscopy and chemical composition research, as well as physical studies of the permeability and movement inside membranes of individual protein and lipid molecules, contributed to the creation of the fluid mosaic model for biological membrane structure. Membranes are impermeable to most polar or charged solutes, but they are permeable to non-polar compounds they are thick from 5 to 8 nm (50 to 80 Å) and appear trilaminar when viewed with an electron microscope in cross-section. The fluid mosaic model identifies the plasma membrane structure as a mosaic of components, including phospholipids, cholesterol, proteins and carbohydrates, giving a fluid character to the membrane. They are a distinctive type of membranes that are structures of lipids that distinguish the cell from its environment. 15.Hint: The border of the cell is defined by the plasma membrane, also known as the cell surface membrane or plasmalemma.All types of plastids possess essentially the same structure because they Answer Active and passive transports across cell membrane differ in Answer Acetabularia used in Hammerling's nucleocytoplasmic experiments is Answer

In this regard, which of the following statements is incorrect? Answer In recent years, this model has been modified in several respects. According to widely accepted 'fluid mosaic model' cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. According to fluid mosaic model, plasma membrane is composed of Answer He should illuminate the object by which one of the following colours of light so as to get the best possible resolution? Answer A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. A major site for synthesis of lipids is Answer Flagella of prokaryotic and eukaryotic cells differ in Answer Electron microscope has a high resolution power. Which of the following are not membrane - bound? Answer Which one of the following is not an inclusion body found in prokaryotes? Answer Water soluble pigments found in plant cell vacuoles are - Answer A cell organelle containing hydrolytic enzymes is - Answer

#Fluid mosaic model of cell membrane download

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The non-polar or hydrophobic linkage are either kept folded inside or used to establish connections with hydrophobic parts of the lipids. Usually their poly hydrophilic linkages are towards the outer side. Protein molecules also possess both polar and non-polar side chains. Most common lipid of the bilayer is phospholipids. It results in formation of a lipid bilayer. The hydrophilic region is in the form of head while hydrophobic part contains two tails of fatty acids. The lipid molecules are amphiatic or amphipathic, that is, they possess both polar hydrophilic (water loving) and non-polar hydrophobic (water repelling) ends.

Protein can be fibrous or globular structural carrier, receptor or enzymatic. cholesterol), glycolipids, sphingolipid (e.g., sphingomyelin, cerebrosides). The important lipids of the membrane are phospholipids (some hundred types), sterols, (e.g. Chemically a biomembrane consists of lipids (20-70%), proteins (20-70%), carbohydrates (1-5%) and water (20%).