1	Biochemistry
2	Carbohydrates There are two types of carbohydrates: The simple sugars Glucose, sucrose, fructose (and many others) The complex carbohydrates. Carbohydrates that are made of long chains of sugars Starches, cellulose
3	Simple Sugars All carbohydrates are made up of units of sugar (also called saccharide units). Carbohydrates that contain only one sugar unit are called monosaccharides.
4	Simple Sugars Disaccharides have two sugar units bonded together. For example, common table sugar is sucrose (below), a disaccharide that consists of a glucose unit bonded to a fructose unit.
5	Complex Carbohydrates Complex carbohydrates are polymers of the simple sugars. In other words, the complex carbohydrates are long chains of simple sugar units bonded together. For this reason the complex carbohydrates are often referred to as polysaccharides.
6	Complex Carbohydrates Starch (below) is a polymer of the monosaccharide glucose (n is the number of repeating glucose units and ranges in the 1,000's).
7	Complex Carbohydrates Glycogen, another polymer of glucose, is the polysaccharide used by animals to store energy. Both starch and glycogen are polymers of glucose. Starch is a long, straight chain of glucose units, whereas glycogen is a branched chain of glucose units.
8	Structure of Glycogen
9	Proteins Proteins are polymers of amino acids. Amino acids all have the general structure: The R in the diagram represents a functional group that varies depending on the specific amino acid in question.
10	Twenty amino acids in human metabolism
11	Proteins When 2 amino acids bond together, water is released as the carboxyl end of one amino acid bonds to the amine end of the adjacent one forming a peptide bond, as illustrated at the left.
12	Proteins When many amino acids bond together to create long chains, the structure is called a protein (it is also called a polypeptide because it contains many peptide bonds).
13	Proteins Proteins are large molecules that may consist of hundreds, or even thousands of amino acids. While there are hundreds of thousands of different proteins that exist in nature, they are all made up of different combinations of amino acids.
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15	Fats Fats are a sub-group of compounds known as lipids that are found in the body and have the general property of being hydrophobic (meaning they are insoluble in water).
16	Fats Fats are also known as triglycerides, molecules made from the combination of one molecule of glycerol with three fatty acids.
17	Fats The type of fatty acid in the molecule determines the type of fat: Saturated fats All single bonds in the carbon chain Solids at room temperature Mono-unsaturated fats One double bond in the carbon chain, the remainder single Liquids at room temperature Polyunsaturated fats Two or more double bonds in the carbon chain Liquids at room temperature
18	Saturated Fats
19	Mono-Unsaturated Fats
20	Poly-Unsaturated Fats