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A protein's function is determined by its structure. The structure of a protein can be described in four different ways, the most basic of which is the primary structure. Proteins are made up of polypeptide ...

A saccharide composed of two sugars. For example lactose is a disaccharide as it contains glucose ( a monosaccharide) and galactose (another monosaccharide) connected by a glycosidic bond

A peptide is usually a short sequence of amino acids. Proteins are much larger structures, also comprised of amino acids, but having different levels of organisation such as forming secondary, tertiary and q...

Charged or polar molecules such as salts, sugars and amino acids dissolve readily in water and so are called hydrophilic ("water loving"). Uncharged or non-polar molecules such as lipids do not dis...

Respiration is the break down of molecules in living cells to release energy. Most commonly glucose (a sugar molecule) is broken down to release energy. Aerobic respiration occurs in animal cells and plant c...