Topics: Fatty acid, Glucose, Fat Pages: 6 (1570 words) Published: August 25, 2014

Cells come to a point where they have to store all their long-term energy in some biological molecules; a group of organic compounds are classified as lipids. These are molecules made mostly from carbon and hydrogen atoms. Lipids contain the same elements as carbohydrates: carbon, hydrogen and oxygen. They solute in nonpolar organic solvents, or basically they don’t solute in water. This is because they are hydrophobic and contain a tail, which is nonpolar and repellent to water. Lipids can be classified into fats and oils, that are the energy storage that mostly animals and humans use beneath their skin, and plants use oil instead of fat for their energy storage. Steroids and Phospholipids are also important lipids too, and they can also be found on living things. They are the plasma membrane in cells. Waxes tend to have protective function in living things. Lipids is the only organic compound that has the most carbon hydrogen bonds than any other compound, as a consequence they store the biggest amount of energy, and more than any other.

According to the “Biology by Sylvia S. Mader” Fat is long-term energy storage by animals. They are made of a molecule called glycerol. (One glycerol plus three fatty acids). It is solid because of the portions of the saturated fatty acids it contains. The tail of the fatty acid is a hydrocarbon chain, that it is what makes it hydrophobic. The main components of soap are fatty acids, the reason is that the head of the chain its soluble in water and it is what washes away the oily dirt, and its tail it’s not soluble in dirty oil. The human body requires fatty acids, but sometimes substances can’t make enough quantity for the fatty acids we need, so we have to get them from food. Fatty acids can be saturated or unsaturated. Fatty acids that have one or more double bonds are the unsaturated fats, and the ones that don’t have double bonds are the saturate ones. The unsaturated fat is monounsaturated if it contains one double bond, and polyunsaturated if it contains more than one double bond. Because of their tightly pack structure, unsaturated facts don’t have molecules of hydrogen in them. Triglycerides containing fatty acids with unsaturated bonds tend to melt at a lower temperature than the saturated bonds. That is because of the double bond it creates a change in the chain that prevents close packing between the hydrocarbon chains. Saturated facts are the ones that have to do with heart diseases. Almost all of the fat that the animals contain is saturated fat, different from plants that use the unsaturated fat. Fat is formed when three fatty acid molecules connect to the OH groups of the glycerol molecule. Fats can’t metabolize as easily as carbohydrates do, but its storage is much more useful, for example one gram of fat gives us twice the energy that one gram of carbohydrates.

Biology book by Sylvia S. Mader


Oils also contain almost the same molecules as the fat does, but different from it, oils have a mixture of triglycerols made by fatty acids but instead of saturated fatty acids like in fat, oils are liquid because they have a big proportion of unsaturated fatty acids. The / describes oil as A triglyceride that is liquid at room temperature. Compared to fat: A slippery or viscous liquid or liquefiable substance not miscible with water. Any of a group of liquid edible fats that are obtained from plants. A type of fat, which is in a liquid form at normal room temperature. Oils are composed largely of unsaturated acids.


A wax is a simple lipid, which is in a long chain alcohol and a fatty acid. Mostly waxes can be found on...
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