For this to happen the DNA must replicate itself exactly. When DNA replicates itself and the cell divides both of the new cells that are produced contain the exact same DNA (barring mutations) which means both new cells can code to make the same proteins.
Americium was first produced in 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley. Although it is the third element in the transuranic series, it was discovered fourth, after the heavier curium.
The selenium atom has a radius of 120.pm and its Van der Waals radius is 190.pm. In its elemental form selenium's CAS number is 7782-49-2. Selenium was discovered and first isolated by JÃ¶ns Jakob Berzelius and Johann Gottlieb Gahn in 1817.