Virus

Viruses are without doubt the smallest organisms on the planet. They have a basic design, which consists of a protein capsule containing RNA or DNA (Many viruses carry there genetic information in RNA instead of DNA). This is an example of a bacteriophage:
Figure 1.1
Because most viruses adapt flawlessly to their host cell, virus structures varies greatly. But there are a few characteristics that viruses share. All viruses have a capsid, which consists of protein and glycoprotein and is where the genetic material is stored. …