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The theory of 'checks and balances' was conceived by the Founding Fathers, to prevent any one person or body from having too much power. This means that all three branches of government - the executive, t...

Taxonomy is how species are scientifically classified. Note, a species is a group of animals that are able to interbreed to produce fertile offspring. Species are organised into groups based on their evol...

Gearing is expressed as a percentage and shows how much capital a business borrows. A company which is highly geared typically has a rate of higher than 50%, whilst a low geared business will have a geari...

Proteins are made up of chains of amino acids. Amino acids are made up of a central carbon atom, joined to one hydrogen atom, an amine group (NH2), a carboxyl group (COOH) and an R group. The R group vari...

Proteins are polymers made of amino acids. Proteins are essential molecules. Among many other roles, they can catalyse numerous reactions within the body (these proteins are known as enzymes), they allow ...