Understanding Viral Replication: How Viruses Multiply

There are no "seven life processes of viruses". Viruses are infectious agents that require a living host to reproduce. They are usually composed of a protein coat (the capsid) that encloses a core of genetic material (either DNA or RNA). Viruses do not have cells and cannot divide on their own; instead, they rely on the metabolic machinery of their hosts to replicate.

Viruses can cause a wide range of diseases in plants, animals, and bacteria, including the common cold, influenza, measles, AIDS, and Ebola. Some viruses are also known to cause cancer.

The study of viruses is called virology.