The cell cycle is the series of events that take place as the cells grow and
divide. In average this process takes about 24 hours for cells in mammals. The game is rather easy to go through if you are familiar with the different phases in the cell cycle (cell growth, chromosome duplication, cell growth again, chromosome separation and finally cell division). If you're not, pay extra attention to the image of the cell cycle in the introduction. As a "Cell division supervisor", inside the cell nucleus, you are to steer the cell division process to make sure everything happens in the right order. If not, the cell will be destroyed and you'll have to start all over again. You also have to make controls now and then, to make sure nothing happened with the genetic material on the way. If you make too many mistakes, the energy level in the cell will drop and the cell division will not be able to proceed. The challenge is to complete the game and to make sure that the cell was correctly divided!
SOFCs are unique since in those, negatively charged oxygen ions travel from the cathode (positive side of the fuel cell) to the anode (negative side of the fuel cell) instead of positively charged hydrogen ions travelling from the anode to the cathode, as is the case in all other types of fuel cells. Oxygen gas is fed through the cathode, where it absorbs electrons to create oxygen ions. The oxygen ions then travel through the electrolyte to react with hydrogen gas at the anode. The reaction at the anode produces electricity and water as by-products. Carbon dioxide may also be a by-product depending on the fuel, but the carbon emissions from an SOFC system are less than those from a fossil fuel combustion plant.  The chemical reactions for the SOFC system can be expressed as follows: