What is a phospholipid?
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a phospholipid is a molecule that forms the basis of cell membranes. it is made up of glycerol undergoing condensation reaction with two fatty acids and 1 phosphate group. due to the phosphate group being charged it causes the phospholipid to have a polar and hydrophilic head and it also has a nonpolar and hydrophobic tail that is made up of hydrocarbons. it is the heads that face the inside and outside external environments in the cell membrane and shield the hydrophobic tails
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Amphipathicity is the nominal characteristic of amphiphilic substances. The most obvious biological advantage is that amphipathetic lipds form the two-layer eukaryotic cell membrane. From a commercially advantaged standpoint, amphipathetics are sold as surfactants.\n\n\nhttp://en.wikipedia.org/wiki/Amphiphilic
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http://web.indstate.edu/thcme/mwking/lipids.html\n\nGood Luck!!!
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LIPIDS:\nOne function for Lipids is that of Energy storage. Lipids contain a lot of calories in a small space. Since Lipids are generally insoluble in polar substances such as water, they are stored in special ways in you body's cells. Lipids can also function as structural components in the cell. Phospholipids are the major building blocks of cell membranes. Lipids are also used as hormones that play roles in regulating our Physiology (metabolism). \n\nCARBOHYDRATES:\nThe main function of carbohydrates is to provide energy, but they also play an important role in the structure and function of the body organs and nerve cells \n\nPROTEINS:\nProteins have many functions. They serve as enzymatic catalysts, are used as transport molecules (hemoglobin transports oxygen) and storage molecules (iron is stored in the liver as a complex with the protein ferritin); they are used in movement (proteins are the major component of muscles); they are needed for mechanical support (skin and bone contain collagen-a fibrous protein); they mediate cell responses (rhodopsin is a protein in the eye which is used for  vision); antibody proteins are needed for immune protection; control of growth and cell differentiation uses proteins (hormones).  These are just a few examples of the many, many functions of proteins.
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As the name implies it is outer thin layer of a LIVING cell.In plant cells in addition to the cell membrane there is a cell wall,either of cellulose or lignin,which is the external most, protective covering.The cell membrane controls the entry and exits of molecules in side the LIVING cell from out side.The cell wall provides protection and gives shape to the cell, both living as well as dead.What we call wood is a collection of billions of dead plants cells that have strong lignified walls.\nAnimal cells lack a proper cell wall.\nOne can easily see a cell membrane with naked eyes. Take a hard boiled poultry egg. Gently crack and remove the outer SHELL which  is of calcium carbonate.Just on its inner side and coverig the WHITE of the egg ( which is now hard and firm) one is sure to find an extermely thin membrane.That is the CELL MEMBRANE! One can see it in afresh egg as well but for a first timer boiled egg is easier. Cell membrane is also called PLASMA MEMBRANE, as it forms the outer limits of the living cytoplasm of a cell.\nThe information above will make one believe that an egg is a cell. Yes it is true in all its aspects. It IS a CELL and since it has to survive out side the animal body, it is provided with a shell which is not a part of the cell.Poultry egg, or for that matter any egg is a cell. An ostrich's egg is the largest cell of all!.
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Try to figure it out for yourself first. \n\nI'll give you a hint though. Lipids are also commonly called fatty ACIDS.\n\nWhat does that suggest?
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It is nothing more than plain old Lecithin.  I'm sure if you bought lecithin instead of phosphatidylcholine it would prabably be cheaper.  It helps your body digest fats, which is good for your brain, liver, skin, and heart, it helps lower cholesterol, MAY help you lose weight, helps remove plaque in your arteries, is a blood thinner, helps other drugs/supplements/foods get into your system faster.\n\nSources of lecithin include egg yolks (best source), soybeans, brewers yeast, legumes, fish and wheatgerm, \nliver, B-complex vitamins, cauliflower, milk, cheese, peanuts, spinach, lettuce, wheat bran, oats, oat bran, grape juice, cabbage, nuts, basil, chili powder, curry powder, garlic powder, mustard seed, parsley, chicken, turkey, bacon, pork, beef, tomato paste, shrimp, cod, orange roughy, salmon, tilapia, navy beans, mutton, veal, muffins, AND chocolate!
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Usually receptors are glycolipids that occur on the surface of a membrane.  The lipid part is part of the membrane, while the glyco- part is the specific receptor.
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The semipermeable membrane that encloses the cytoplasm of a cell.
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it has phospholipids that have two polls one hydrophobic and the other hydrophylic. That's how it connects the lipids with H2O.\nHope this helps :)
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phosphorescence, this link should tell you.
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HELLO Amina,\nGlycerols are actually a sort of derived lipids obtained by hydrolysis of fats with water at high temperatures and pressures. it is in fact a trihydroxy alcohol, which is sweet and viscous. It forms esters like Triacyl glycerols(TGs) or Diacyl Glucerols or Monoacyl Glycerols  (or otherwise called Tri Glycerides) with fatty acids and phosphates. TGs are neutral fats, which, like cholesterol form the fat content of the body. These TGs get oxidized inside the mitochondria of cells  in the absence  (or scarcity) of glucose and act as a source of energy during starvation or dieting. Glycerol esters of higher fatty acids remain solid in room temperature and examples of such TGs include various vegetable oils. \nFatty acid esters with phosphate groups(PO4=) can form phosphoglycerides when they contain glycerol as the alcohol. Such compounds are important as protectors of the nervous tissue. Egs include phosphatidyl choline, and Lecithin. The last one is also present in Heart and liver..\nOoohhh that was a pretty long answer. \nHope I didn't get too technical and i suppose iwas clear on the topic,\nSo long then..
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Cholesterol and triglycerides are two forms of lipid, or fat. Both cholesterol and triglycerides are necessary for life itself. Cholesterol is necessary, among other things, for building cell membranes and for making several essential hormones. Triglycerides, which are chains of high-energy fatty acids, provide much of the energy needed for cells to function.
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Chem.) A poisonous nonmetallic element of the nitrogen group, obtained as a white, or yellowish, translucent waxy substance, having a characteristic disagreeable smell; this waxy allotropic form is also called yellow phosphorus, to distinguish it from another allotropic form, red phosphorus. It is very active chemically, must be preserved under water, and unites with oxygen even at ordinary temperatures, giving a faint glow, - whence its name. It always occurs combined, usually in phosphates, as in the mineral apatite, in bones, etc. It is used in the composition on the tips of friction matches, and for many other purposes. The molecule contains four atoms. Symbol P. Atomic weight 31.0.
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All biological membranes, including the plasma membrane and the internal membranes of eucaryotic cells, have a common overall structure, they are assemblies of lipid and protein molecules held together by noncovalen interactions. The Lipid molecules are arranged as a continuous double layer 4 to 5 nm thick. This lipid bilayer provides the basic structure of the membrane and serves as a relatively impermeable barrier to the flow of most water- soluble molecules.The proteins molecules are dissolved in the lipid by layer.
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Fats are entirely polar substances, and do not dissolve in water.  They are composed of Carbon, Hydrogen and Oxygen.\nFats are used in protection, storage and keeping the organism warm.\n\nPhospholipids have phosphorous groups attatched, and have one polar and one non polar end.  (One water loving end that can "dissolve" in water, and one end that hates water.)\nPhospholipids are found the phospholipid bilayer of the cell membrane and are used to seperate the cell from it's environment, as well as letting some things in while keeping others out.\n\nHope that helped.
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DNA\nRNA\ncarbohydrate (eg glycogen)\npolypeptides (proteins)\nmucopolysaccharides (proteins joined to carbohydrates)\nlipopolysaccharides (proteins joined to lipids)\nother lipids eg in membranes, and storage fat\n\nThere may be others.