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An antigen is a substance that is introduced to the body and stimulates an immune response and the production of antibodies. Antibodies are proteins produced by cells in the body in in repsonse to the pre...

Price elasticity of demand or PED is a very useful concept in microeconomics. In order to understand this, lets quickly talk about what demand is. Demand in economics refers to the willingness and ability...

Proteins are polymers composed of amino acids (monomers) which are joined together. The shape of the protein has an impact on its role within the body. Muscles, hormones, antibodies and enzymes (biologica...

A divergent (constructive) plate boundary is one where the two plates are moving APART from each other in opposite directions. As these plates move apart they create cracks in the earth's...

Semi-colons (;) are used to join two relating clauses together, which could have been separated by a full stop. An example would be "It was raining outside; Colin picked up the umbrella". These ...