4 shapes of a virus

By: Nia Felton

The first two shapes of a virus

The first shape of a virus is icosahedral. This virus as 20 sides, which are made out of equilateral triangles. This virus has a 5:3:2 symmetry. The genetic material is fully enclosed inside the capsid. An example of a icosahedral virus is called Rhinovirus. The next virus is the enveloped virus. the enveloped virus fuses with the host's membrane to gain access. It is surrounded (or enveloped) by a lipid bilayer. Once it enters the cell, it infects the cell. An example of an enveloped virus is the Hepatitis C.

The last two shapes of a virus

The last two shapes of a virus are helical and complex. The helical shaped virus is where the protein capsid forms and helical structure, and has a central cavity with a protein shell. It creates a tube in the middle for nucleic acids. Tobacco Mosaic Virus is an example of a helical structure. The complex shape virus has a complex outer wall and it only infects bacteria. It drills a hole in the cell wall and inserts its DNA using its tail as a channel. An example of a complex shaped virus is a bacteriophage, which can cause pix virus.

The 4 shapes of a virus and how they work