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Active site of (enzyme) has a specific active site, complementary to (substrate). Only that (substrate) can bind to this active site to form an enzyme substrate complex.  

Split into yes v no, with around 2 or 3 paragraphs for each side of the argument (depending on marks for the question). Yes: they represent minority views (with about 3 different pressure group examples f...

The sigma bond results due to the overlapping of orbitals along an inter-nuclearaxis.  In other words if two s orbitals are directly overlapping, then the bond formed is linear b...

The price elasticity of a good measures the proportionate change in demand to an inital change in price. If a good is price inelastic it suggests that an increase in price leads to a less than proportiona...

None caluclator paper, so you know that the divisions/multiplications will be relatively simple. First thing to do is convert both measurements we have into the same units (in this case millimetres). We s...