65) According to the genealogical species concept, a prokaryotic species is: A c

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65) According to the genealogical species concept, a prokaryotic species is: A cohesive group of strains that cluster together phylogenetically based on DNA sequence similarity An interbreeding population that is isolated from other interbreeding populations A group of related populations that possess similar ecological roles A group of related strains having similarly sized genomes It is not possible to define prokaryotic species a. b. c. d. e. Which of the following is NOT a mechanism by which microbes are able to protect nitrogenase from O2 during N2 fixation? 66) Forming heterocysts that do not perform oxygenic photosynthesis Rapid respiration to consume available oxygen Microbial synthesis of leghemoglobin to bind O2 and reduce free O2 levels Formation of physical barriers to O2 diffusion such as slime layers a. b. c. d. All of the above are performed by N2 fixing bacteria to protect nitrogenase 67) Assume you have two metagenomic data sets of equal size (equivalent number of sequencing reads). One is from a low diversity acidic pond (7 species) and the other from a highly complex soil environment (7000 species). With these data sets you perform independent "assembly-driven analyses, i.e. attempt to assemble genomes! Which of the following best describes the expected results from the bioinformatic("in silico") analysis of the highly complex soil environment data compared to the low diversity sample analysis? Near complete genomes assembled for dominant populations Near complete genomes assembled for rare populations Little or no genome assembly It is not possible to sequence DNA from complex environments a. b. . e. The extent of genomes assembled will be equal between the two samples 68) A potential negative consequence of ocean iron fertilization geoengineering strategies is: a. Increased photosynthesis by oceanic phytoplankton b. Stimulation of toxic phytoplankton blooms c. Increased uptake of atmospheric CO2 by oceanic phytoplankton d. Stimulation of siderophore producing bacteria e. None of the above are negative consequences 69) The process of biological nitrogen fixation: a. converts N2 to NH b. converts NHs to NO3 c. converts N2 to NOs d. converts NH3 to N2 e requires oxygen

Explanation / Answer

Ans 65 : b) An interbreeding population that is isolated from other interbreeding populations.

Genealogical concept of species is a type of phylogenetic concept , according to which the members of a particular species are all the more closely related to each other then the members of any other species. Since the breeding taked place within the same group , so the genetic material remains conserved and differences begin to develop with the members of the other species.

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