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 G1/S checkpoint: This ensures that damaged DNA is not replicated and is one of the better-understood DNA damage checkpoints in mammalian cells. The tumor suppressor p53, one of the most commonly mutated genes in cancer, plays an important role in DNA damage induced G1/S arrest and apoptosis.