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.
Part of the cooling system in Pressurized Water Reactors where the heat from the reactor is used to make steam for the turbine. Some reactor designs, called Boiling Water Reactors, do not have S/Gs but instead allow boiling in the reactor core to produce steam for the turbine.. Containment.