Types of viruses Animation
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All viruses have genetic material—either DNA or RNA—enclosed within a protein coat.
The tobacco mosaic virus is a helical plant virus. The protein subunits of its coat are arranged like a spiral staircase, with RNA in the middle.
A bacteriophage is a complex virus that infects bacteria. The protein coat includes a variety of structures such as a sheath and tail fibers, which play a role in the infection process.
The “head” of the virus encloses the viral DNA.
Adenoviruses are polyhedral viruses that infect animals. Many cause human colds.
The virus’s protein coat has a geometric shape with many flat sides, and the genetic material is DNA.
Human immunodeficiency virus, or HIV, is the cause of AIDS. Its outer envelope of lipids and proteins is derived mainly from the plasma membrane of its previous host cell.
Within the envelope is a protein capsid that contains viral RNA and some enzymes.