The structure of the nucleus is that it has the protons (+) and the neutrons (0).
<span>In molecular biology and genetics, mutations are defined as changes in a genomic sequence and the DNA sequence of a cell's genome or the DNA or RNA sequence of a virus. They can also be defined as spontaneous changes in the cell. Generally, mutations are caused by radiation, viruses, transposons and mutagenic chemicals.
</span><span>Transposon is </span>a segment of DNA that is capable of inserting copies of itself into other DNA sites within the same cell.