Chapter Overview

Viruses:

Are a unique group of tiny infectious particles that are obligate parasites of cells.
Do not exhibit the characteristics of life, but can regulate the functions of host cells.
Infect all groups of living things and produce a variety of diseases.
Are not cells but resemble complex molecules composed of protein and nucleic acid.
Are encased in an outer shell or envelope and contain either DNA or RNA as their genetic material.
Are genetic parasites that take over the host cell’s metabolism and synthetic machinery.
Can instruct the cell to manufacture new virus parts and assemble them.
Are released in a mature, infectious form, followed by destruction of the host cell.
May persist in cells, leading to slow progressive diseases and cancer.
Are identified by structure, host cell, type of nucleic acid, outer coating, and type of disease.
Are among the most common infectious agents, causing serious medical and agricultural impact.

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