Cell membrane
Phospholipids are not triglycerides. There is a small but very important difference in the structure of phospholipids compared to triglycerides. Instead of having 3 fatty acids attached to the glycerol molecule, one is replaced by a phosphate group, made up of phosphorus, oxygen and hydrogen. Phospholipids make up the basic structure of a cell membrane. A single phospholipid molecule has two different ends: a head and a tail. The head end contains a phosphate group and is hydrophilic. This means that it likes or is attracted to water molecules.  Phospholipids are a class of lipids that are a major component of all cell membranes. They can form lipid bilayers because of their amphiphilic characteristic. The structure of the phospholipid molecule generally consists of two hydrophobic fatty acid tails and a hydrophilic head consisting of a phosphate group. The two components are joined together by a glycerol molecule. The phosphate groups can be modified with simple organic molecules such as choline The phospholipids make up most of the cell membrane, the cell  membrane controls what goes in and out of cells and the  phospholipids helps with this because the 'heads' are … hydrophilic  and the 'tails' are hydrophobic. The phosphate head is hydrophilic and the two hydrocarbon tails are hydrophobic. In water, phospholipids form double layer with the hydrophilic heads in contact with water on both sides and the hydrophilic tails away from water in the centre. This arrangement is found in biological membranes. 1. Cell membranes are based on lipid bilayer. Plasma membranes consist of a lipid bilayer with proteins embedded in the bilayer. The principle lipids are phospholipids. A phospholipid molecules has a hydrophilic head with a phosphate group as part of its structure and two hydrophobic tails. The hydrophobic tails consist of long hydrocarbon chains.  You hopefully remember that phospholipids are the molecules that make up the plasma membrane. and all of the membranes of a human cell (nuclear membrane, lysosomal membrane, both mitochondrial membranes, endoplasmic reticulum, Golgi apparatus). They have a polar, hydrophilic head and two non-polar, hydrophobic tails.  Phospholipids make up an important class of lipids for the construction of cell membranes. The phospholipids are not true fats because they have one of the fatty acids replaced by a phosphate group. This sketch of a phospholipid molecule shows two fatty acids and a phosphate group attached to a glycerol backbone. Stearic acid is shown as the fatty acid, but there are many variations in the fatty acids.  Lipid Bilayer. Lipid Bilayer Phospholipids make up the basic structure of a cell membrane. Phospholipids are more polar than the lipids discussed thus far (triglycerides), because they contain a phosphate group bound to an amino alcohol unit in place of one of the ester linkages of a triglyceride.  Your cells are surrounded by a very important type of lipid, called phospholipids. Phospholipids consist of a hydrophilic (or 'water loving') head and a hydrophobic (or 'water fearing') tail. Phospholipids like to line up and arrange themselves into two parallel layers, called a phospholipid bilayer. The phospholipids make up most of the cell membrane, the cell  membrane controls what goes in and out of cells and the  phospholipids helps with this because the 'heads' are … hydrophilic  and the 'tails' are hydrophobic. A phospholipid is made up of a hydrophobic (water-avoiding) tail and a hydrophilic (water-liking) head. the OH group in C1 is esterified with a saturated Fatty acid. the OH group iin C2 is esterified with unsaturated fatty acid.
http://www.innovateus.net/science/what-are-phospholipids http://study.com/academy/lesson/cell-membrane-functions-role-structure.html https://en.wikipedia.org/wiki/Phospholipid http://www.answers.com/Q/What_cell_structures_are_made_of_phospholipids http://blogs.jccc.edu/pdecell/the-entangled-bank-biology-resources/structure-of-cell-membranes/ http://homepage.smc.edu/wissmann_paul/anatomy2textbook/phospholipids.html http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/phoslip.html http://www.foothill.edu/attach/psme/Norick.30B.24Continue.ppt http://study.com/academy/lesson/what-is-a-phospholipid-structure-functions-composition.html http://www.answers.com/Q/What_is_the_structure_of_a_phospholipid
phospholipid make up which of the following structures