A DNA is built from charged electrons and atoms and has the inductor-like structure. This structure could be divided into linear, toroid and round inductors. These inductors interact with external electromagnetic waves, move and produce some extra waves within the cells. The shapes of these waves are similar to shapes of hexagonal and pentagonal bases of their DNA source. These electromagnetic waves interact with charged particles on the nuclear membranes and lead to their vibrations. By these vibrations, nuclear membranes act like vibrators within a speaker/microphone and some new ultrasound waves are emerged. Thus, DNAs within cells emit both electromagnetic and ultrasound waves. These waves produce some holes in liquids within the nucleus and cells. To fill these holes, some extra hexagonal and pentagonal bases are produced. These bases could join to each other and form some viruses like Coronavirus. To produce these viruses within a cell, its need that wavelength of external waves be shorter than the size of a cell. Thus 5G millimeter waves could be good candidates for applying in constructing Coronaviruses (COVID-19) within biological cells.