Microcheck 107

Methods used to classify prokaryotes according to their genotype include G + C content, DNA hybridization, and comparing the sequences of 16S ribosomal nucleic acid.

■ Explain why two organisms that have identical GC contents might be completely unrelated.

■ Explain why 16S rDNA has proved so useful in determining evolutionary relatedness.

■ Why would it be easier to sequence rDNA than rRNA?

Desulfovibrio desulfuricans

Desulfuromonas acetexigens

Bdellovibrio bacteriovorus

Chondromyces crocatus

Stigmatella aurantiaca

Myxococcus xanthus

Figure 10.18 A Phylogenetic Tree Each branch represents the evolutionary distance between two species. An external node, marked with a species name, represents an organism that still exists. An internal node, a branch point, represents an ancestor to today's organisms.

Bacterial Vaginosis Facts

Bacterial Vaginosis Facts

This fact sheet is designed to provide you with information on Bacterial Vaginosis. Bacterial vaginosis is an abnormal vaginal condition that is characterized by vaginal discharge and results from an overgrowth of atypical bacteria in the vagina.

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