Lipid
* All lipids are amphipathic , that is, they have hydrophilic and hydrophobic regions
  - form bilayer membranes
  - have many more nonpolar bonds or regions than polar bonds or regions
* Many lipids are made of numerous fatty acids
  - surfactants and spontaneously form organized structures at interfaces
* Most lipid is stored in the fat body, although small amounts are found in other cells.
* Most lipids are produced by glands
  - mammary glands
  - combine with proteins
  - improve capacity
  - promote uptake
* Some lipids contain acid
  - alcohol
  - phosphorus
  - derive from cholesterol
  - even span the membrane, with hydrophilic groups on each end of a hydrophobic molecule
  - function as hormones
* accumulate and form small lipid droplets.
* allow buoyancy as they are less dense than water and help some animals float in water.
* also increase buoyancy and can reduce the energy required for swimming
  - maintain the structure and support of our organs
  - protect the body's organs from shock and damage and provide insulation for the body
* are a type of fat and fats are considered carbohydrates which are organic compounds
  - varied group of molecules most of which are insoluble in water
* are also on the external surface of the cell wall to protect the wall from injury
  - useful in buoyancy because they float, and as insulation from the cold
  - an essential component in all the body's cells
  - another energy source found in plants
  - broken down into fatty acids and glycerol by lipases
  - classified as simple and complex
  - composed offatty acids attached to glycerol
* are fats in the bloodstream and in all of the body's cells
  - oils and waxes
* are fats or fat-like substances found in plants and animals
  - fatlike substances
* are fats, and the term is usually used to refer to both cholesterol and triglycerides
* are fatty substances that play a variety of roles in the cell
  - substances, such as cholesterol, found in the blood
  - greasy organic compounds that circulate in the bloodstream
  - important constituents of all living organisms
  - insoluble in water and consist of fats
  - largely hydrocarbons, long chains of carbon atoms with associated hydrogens
  - long chains of carbon and hydrogen molecules
  - macromolecules
  - molecules that dissolve in non-polar solvents like hexane or ether
  - nonpolar, hydrophobic molecules
  - oily substances, known as chief ingredients of the cell's membranes
  - one of the functional components of all living things
* are organic compounds that are non polar and have a unique way in storing energy
  - matter
* are organic molecules that are insoluble in polar solvents such as water
  - dissolve in organic solvents
  - physiologically active
  - polymers
  - present and located in the envelope
* are present in all living cells, but the proportion varies from tissue to tissue
  - cartilage but their function is unknown
* are the fat-like components of cell membranes, an essential element of all living organisms
  - fats that circulate in blood
  - free fatty acid fractions in the blood, including cholesterol and triglycerides
  - main constituents of cell membranes and are, in essence, biological soaps
  - most diverse group of biochemicals
* are the most efficient energy storage molecules in cells
  - way to store energy, for instance
  - only nutrient that the body has an unlimited capacity to store excess
  - varied in structure
  - very poor
* are vital to animals and plants in many ways
  - the integrity of cell membranes and to new plant growth
* block the diffusion of ions across the plasma membrane.
* can be part of an emulsion but can never stabilise an emulsion.
* can combine with proteins to form lipoproteins , e.g. in cell membranes
  - diffuse
  - either be in two dominant forms, exogenous or endogenous
  - provide non-protein calories
  - serve as energy sources for cells
* come together to fats.
* comes from the Greek lipos, meaning fat.
* contain almost twice as much energy per unit weight than carbohydrates.
* exhibit some membrane solubility.
* form the barriers surrounding various compartments within an organism.
* function in the long-term storage of biochemical energy , insulation, structure and control.
* have a variety of functions in living organisms
  - many important physiological roles
* includes atoms.
* includes chemical chain
  - waxes, fats, oils, steroids and among others
* is an organic compound
  - one of the premier journals published in the lipids field today
* move laterally in a membrane, but flip-flopping across the membrane is rare.
* never do.
* occur between the distinct layers of keratin toward top of figure
  - in the general protoplasm and Pectins are present in quite large amounts in tea
* offer unique pharmaceutical benefits.
* perform many important roles.
* play energy storage and structural roles in cells, and many hormones are lipids.
* pose a problem to drug delivery systems.
* provide energy and give structural support.
* release large amounts of energy when broken down.
* require sterols for their transport and are steroid precursor.
* serve a number of functions in the human body
  - as a source of fuel and are one of the main components of cell structure
* spontaneously form bilayers.
* supply about twice the energy as proteins and carbohydrates.
+ Biochemistry, Macromolecules, Lipids
  * Lipids are fats, and waxes. Saturated lipids contain single bonds, and are found in butter and lard. Unsaturated lipids have one or more double bonds. The human body stores lipids as an energy source. When the body needs a large amount of energy, lipid molecules are broken down to release that energy.
  * A 'lipid' is a type of molecule useful in biology. It is also oily or waxy. Fats are made from lipid molecules. Sources of lipid can be found in algae, seeds, meat, cheese, butter and fish. Lipids are long chains of carbon and hydrogen molecules. Lipids are classified as simple and complex. Examples of complex molecules could be steroids or phospholipids.