In this situation, translation begins at the 5' end of the mRNA while the 3' end is still attached to DNA. In all types of cells, the ribosome is composed of two subunits: the large (50S) subunit and the small (30S) subunit (S, for svedberg unit, is a measure of sedimentation velocity and, therefore, mass).
The most common types of nuclear power plants use water for cooling in two ways: 1  To convey heat from the reactor core to the steam turbines. 2  To remove and dump surplus heat from this steam circuit.
Feedwater heaters are used preheat the water in order to decrease the heating time in the boiler and increase the plantâs overall efficiency. In large power plants, the water that exits the condenser is sent through a series of feedwater heaters. The tanks are heated by steam from the turbine.