There are two types of plasmid integration into a host bacteria: Non-integrating plasmids replicate as with the top instance, whereas episomes, the lower example, can integrate into the host chromosome.
Viruses are structured to reproduce and they do this in two ways, using the lytic cycle and lysogenic cycle. The pace of reproduction differs but the process is the same. They invade a host cell and begin to multiply before killing the cell.
How a Virus Infects You.In the lytic cycle, the virus reproduces itself using the host cell's chemical machinery. The red spiral lines in the drawing indicate the virus's genetic material. The orange portion is the outer shell that protects it.