Prescott's Microbiology
Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 19.4, Problem 4CC

You are building a tree based on 16S rRNA sequence alignments of a group of spirochetes. Suggest a possible outgroup so that you can build a rooted tree. Refer to chapter 21 if you need more information about these bacteria.

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Why does the genus Streptomyces of the Actinobacteria clade secrete chemicals (antibiotics) that can kill other bacterial species? Please answer asap and type your answer and do not copy from anywhere please
Why did Carl Woese propose the domain Archaea? The domain Bacteria already had too many organisms in its classification. The methanogens were discovered to be a complex organism, between prokaryotic bacteria and eukaryotes, thus it needed its own domain. He discovered that methanogens were too large to be classified as bacteria, but too small to be classified as Eukarya. In analyzing the rRNA of methanogens, he discovered that it was completely distinct from any other bacterial RRNA that had been studied. The DNA of methanogens was discovered to use different nucleotides than those of organisms in Eukarya or Bacteria.
Consider the fact that the use of 16S rRNA sequencing as a taxonomic and phylogenetic tool has resulted in tripling the number of bacterial phyla. Why has the advent of this genetic technique expanded the currently accepted number of microbial phyla?

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Prescott's Microbiology

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