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There are four structures of a protein: the primary, secondary and tertiary. Primary is the sequence of amino acids in the protein. The secondary structure is the way the protein is either folded into a p...

Vaccination involves the injection of small amounts of a pathogen - a microbe that causes disease - that is either dead or modified to provoke an immune response. Although these pathogens cannot ca...

A common law system is the term used to denote the type of legal tradition we have in the UK. The term also describes what our sources of law are. Other areas of the world - such as European countries - h...

This question uses the ideal gas equation. pV = nRT where the temperature is in Kelvin, the pressure in pascals and the volume in m3. To obtain the number of moles the equation is rearranged to give p = n...

Homogeneous goods, Firms are price takers, An infinite number of suppliers and producers, Firms are profit maximisers, There are no barriers to entry, Producers have perfect information