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.
For eukaryotic cells containing extensive cell cycle checkpoint controls, the duration of mitosis is somewhat independent of the total length of the cell cycle, and depends on the size of the cell. Yeast: Cell cycle takes ~100 minutes, mitosis takes ~20 minutes. Chicken cells (DT40 line): Cell cycle ~8 hours, mitosis ~30 minutes.