Types Of Viruses

By: Katelynn Bush

What is a virus?

an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.

Fact About The Virus:

The virus TMV tried to infect a nucleous and created the first born cell, and that caused the cell to start to create all life.

Virus Shapes:

TMV Virus Shape:

Helical Virus:


This virus structure has a capsid with a central cavity or hollow tube that is made by proteins arranged in a circular fashion, creating a disc like shape. The disc shapes are attached helically (like a toy slinky) creating a tube with room for the nucleic acid in the middle. All filamentous viruses are helical in shape. They are usually 15-19nm wide and range in length from 300 to 500nm depending on the genome size. An example of a virus with a helical symmetry is the tobacco mosaic virus.

Virus Summary:

Viruses are everywhere and we take in millions of them every second. Some are bad, and some are actually good.