The UK's most valuable monument is deemed to be the 1,000-year-old Tower of London, which is worth an estimated Â£56billion to the British economy and came it at number five in the list of European list. Its value is six times more than its nearest rival the Colosseum in Rome, which is valued at Â£72billion.
Cell cycle checkpoints are control mechanisms in eukaryotic cells which ensure proper division of the cell.
The First Gap Phase inter-phase ends with a 'restriction point or checkpoint'. Checkpoints are used in the cell cycle to make sure that only strong cells with no mutations are copied all through the division process. Cells not passing the checkpoint is put into the gap zero (G0) phase.