17. RNA viruses require their own supply of certain enzymes because host cells l

Question

17. RNA viruses require their own supply of certain enzymes because host cells lack replicate the viral genome. 18. in bocteria, genetic troits that need to change rapidly in order to respond to changes are usually located in plasmids 19. In prokaryotes, meiosis is one of the mechonisms that con enhance genetic varic 20. Prokaryotic genomes are composed of circular 21. Which of the following statements is TRUE about proteobacteria? a) They have a thick peptidoglycan cell wall. b) They lack flagellae. c) The have an outer lipopolysaccharide membrane d) Very few are pathogenic e) None of the statements are true about proteobacteria 22. Assuming that each of these possesses a cell wall, which prokaryotes should be expected to be most strongly resistant to cell destruction in hypertonic environments? a) extreme thermophiles b) extreme halophiles c) nitrogen-fixing bacteria that live in root nodules d) methanogens e) cyanobacteria 23. Which of the following is problematic when the goal is to construct phylogenies that accurately refl evolutionary history? a) Polyphyletic groups b) Paraphyletic groups c) Monophyletic groups d) Two of the responses are correct. e) None of the above. 24. Some molecular data place the giant panda in the bear family (Ursidae) but place the lesserp the distantly related raccoon family (Procyonidae). Consequently, the morphological similarities of two species are probably due to a) Inheritance of acquired characteristics b) Sexual selection. c) Possession of structures that have arisen via convergence. d) Inheritance of shared derived characteristics e) Possession of shared ancestral characteristics.

Explanation / Answer

20)Its true that the prokaryotic genome is generally circular.

21) Proteobacteria have an outer lipopolysaccharide mambrane. So the correct answer here is (c).

22) Extreme halophiles will resist the damage in the hypertonic solution. So the correct option is (b).

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