What are cosmids? Special plasmids Cosmids are just a specific kind of plasmid, which are indpendent units of DNA that can move between bacteria. That is, they are similar to viruses in that they’re in the gray area of what we might consider “life”, but they are different from viruses in that they do not code for their own protective membrane like a virus or a cell would. One misconception that I had during my learning about cosmids was how they can have longer sequences than regular pl...
