Bacteria are unicellular organisms that lack a nuclear membrane ( FIGURE 8.5). Most bacterial genomes consist
I 8.5 Most bacterial cells possess a single, circular chromosome not bounded by a nuclear membrane. (K.G. Murti/Visuals Unlimited.)
of a circular chromosome that contains a single DNA molecule several million base pairs in length. For example, the genome of E. coli has approximately 4.6 million base pairs of DNA (such as V cholerae). However, some bacteria contain multiple chromosomes, and a few even have linear chromosomes. Bacterial chromosomes are usually organized efficiently, with little DNA between genes.
www.whfreeman.com/pierce General information on bacteria, bacterial structure, and major groups of bacteria, with some great pictures
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