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(Graphic computer art by Daniel Yuen). A circular bacterial chromosome is a bacterial chromosome in the form of a molecule of circular DNA. Unlike the linear DNA of most eukaryotes, typical bacterial chromosomes are circular. Most bacterial chromosomes contain a circular DNA molecule â there are no free ends to the DNA. Free ends would otherwise create significant challenges to cells with respect to DNA replication and stability.
This association is called lysogeny, and the integrated phage DNA is referred to as a prophage (Figure 6-19). Under certain conditions, the prophage DNA is activated, leading to its excision from the host-cell chromosome and entrance into the lytic cycle. Bacterial viruses of this type are called temperate phages. virus is a small parasite that cannot reproduce by itself. Once it infects a susceptible cell, however, a virus can direct the cell machinery to produce more viruses. Most viruses have either RNA or DNA as their genetic material.