Structure of a virus:
- genetic information molecule
- protein layer that envelopes the above molecule (capsid)
- Inside there are nucleic acids that form either RNA/DNA.
- Helical
- Icosahedral
- Envelope
- or a combination called complex
Width: 15-19 nm
Length: 300-500 nm
virus known to have this shape: filamentous virus ex. tobacco mosaic virus
filamentous virus usually infect gram negative bacteria.
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The icosahedral shaped virus has a sphere-like shaped made from fused equilateral triangles. These triangles are "identical protein sub units". This prime shape holds the genetic material within. Virus's with this shape tend to be released when a cell lyses.
amount of protein sub-units: 20 faces
size: 70-90 nm
know viruses with this shape: polio virus, rhinovirus, and adenovirus
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The envelope shaped virus is a standard helical/isocahedral virus except it is encased in a lipid bilayer membrane.These membranes come from the host cell.
known viruses of this type: hepatitis C, HIV, and influenza virus.
![](https://upload.wikimedia.org/wikipedia/commons/f/f0/Lipid_bilayer_section.gif)
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Complex type of virus have a head and tail they also only infect bacteria. The tail creates a hole in cell wall of caught bacteria then releases DNA into it. These complex viruses are among the largest. Also known as bacteriophage
Examples of this type: smallpox virus(variola).
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https://youtu.be/CBMr142ynbk
https://youtu.be/Ofd_lgEymto
https://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3A0af319c1f63d9f6a49d9b6245463fc8fea256fd364c6a8e427999d1d%2BIMAGE_THUMB_POSTCARD_TINY%2BIMAGE_THUMB_POSTCARD_TINY.1
http://figures.boundless-cdn.com/14011/raw/tevenphage.svg
https://upload.wikimedia.org/wikipedia/commons/f/f0/Lipid_bilayer_section.gif
https://youtu.be/_HvKxgihn4I
http://images.slideplayer.com/34/8309974/slides/slide_6.jpg
https://morgridge.org/wp-content/uploads/Virus-Structure.pdf
http://www.twiv.tv/wp-content/uploads/2009/07/helical-symmetry2-1024x775.jpg
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