Viral Structure.

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Presentation transcript:

Viral Structure

Viruses Tiny Nonliving The name virus is Latin for “poison.” Can be seen only with a powerful electron microscope Nonliving Not made up of cells Cannot metabolize their own energy Can only reproduce inside a host cell (parasites) The name virus is Latin for “poison.”

Viral Structure Differ widely in size and structure Have a nucleic acid (DNA or RNA) Surrounded by a protein coat called a capsid Capsid proteins match the proteins on the host cell and are highly specific

Review Question #1 Why is a virus not considered to be alive?

Review Question #2 Why can most viruses infect only a few kinds of cells?