Explain the life cycle of virus?
Virus do not have independent existence. To survive virus completes four stages in a host cell .
To survive in a host cell virus undergoes four stages.
The first stage is viral entry. To enter the cell virus uses its proteins to enter the cell membranes. Attachment, or adsorption, occurs between the viral particle and the cell membrane, then the virus particle or its genetic contents are released into the host cell, where replication of the viral genome may commence.
Second stage is viral replication Virus takes control of the replication mechanism of the cell. Then virus makes copies of its own genome .
Third stage is viral shedding. The cell no longer is useful due to exhaustion of its resources. Virus must find now a new host.
Fourth stage is sometimes if new host cell is not available immediately it hide within the cell. This is called viral latency.