If unlimited space and food were available to a single bacterium and if all of its offspring divided every 20 minutes in just 48 hours they would reach a mass of approximately 4000 times the mass of the earth!
In its own way, a lytic virus is similar to a desperado in the Old West. First, the outlaw eliminates the town’s existing authority (host cell DNA). Then, the desperado demands to be outfitted with new weapons, horses, and riding equipment by terrorizing the local people (using the host cell to make proteins). Finally, the desperado forms a gang that leaves the town to attack new communities (the host cell bursts, releasing hundreds of virus particles).
organisms that live on or in a host organism from which it obtains nutrients, and it usually does harm to the host
Are viruses alive? yes Change Over Time yes Response to Environment yes Obtain and Use Energy Yes; in multicellular organisms, cells increase in number and differentiate Growth and Development DNA Genetic Code Independent cell division either asexually or sexually Reproduction Cell membrane, cytoplasm; eukaryotes also contain nucleus and organelles Structure Virus Cell Characteristic Cells and Viruses
19 – 3 Diseases Caused by Bacteria and Viruses
Bacteria and viruses are everywhere in nature, but only a few cause disease