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.
1 When wet cooling towers â like the ones used by more than thousands of industrial businesses today â were developed, the goal was to create a system where waste water can be re-used multiple times; good cooling tower manufacturers will provide systems that use up to 98% of recycled water.