checking to see if my answers are correct Microbes are found in many environment
ID: 267725 • Letter: C
Question
checking to see if my answers are correct
Microbes are found in many environments. The following questions pertain to the ecoloay st microorganisms and their association with humans 14. Which of the following are criteria for determining if two bacteria are different species at the DNA level? DNA from the respective bacteria must hybridize more than 70% DNA from the respective bacteria must hybridize less than 70% C. DNA from the respective bacteria must hybridize less than 80% 16S sequences must differ by less than 3% 16S sequences must differ by more than 3% e following bacterial phyla are associated with Gram-positive bacteria? A. Acidobacteria B. Fermicutes Proteobacteria D Bacteroidetes E. Tenericutes 16. Which of the following Domains of Life are descen dents of the Last Universal Common Ancestor (LUCA)? Bacteria B. Plantae C. Archaea D Eukarya E. Monera isms NOT found?Explanation / Answer
14) Options A and D are correct answers.
DNA-DNA hybridization and G+C content are very important testes for the novel bacterial determination. If the DNA-DNA hybridization test show less than 70% your strain is a new species. Similarity of 16S rRNA of the unknown isolate with reference species or strain below 97% represent the new type strain of the unknown isolate.
15) Option B is the correct answer.
All the other bacteria are classified as gram-negative. Firmicutes are low G+C, gram-positive species.
16) Options A, C and D are correct answers.
Bacteria are directly descended from LUCA, while archae and eukarya descended from a common branch arising from LUCA.
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