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Oestrogen is a lipid soluble molecule, so it diffuses into the cell across the plasma membrane. It then binds to a recptor inside the cell and this causes it to relocate to the nucleus. The receptor then act...

A population is split into two groups by some form of barrier, either physical, such as a mountain range, or behavioral, like looking for food at different times of day. This means that the two populations c...

Transition metals form coloured ions in solution. They have variable oxidation states, and often can be sued as catalysts. They are also able to form complexes with non-metal ligands, such as H2O or NH3, whe...

OCR A Level English Literature is marked according to five assessment objectives. The last of these is AO5 which requires you to explore your texts by using different interpretations. This is required for mo...

The death of Dido marks the end of Book 4 of Virgil's Aeneid. The Queen of Carthage stabs herself in a fiery rage following her abandonment by her lover Aeneas, who leaves Carthage to continue with his desti...