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8 biology questions




Question;1. Compare the embryos of chickens, humans and;fish, and describe in detail how pharyngeal arches show a shared evolutionary;past?;2. Explain how reproductive barriers result in the;development of different species.;3. Explain what is meant by the statement, evolution;does not have a goal.;4. Explain why you would or would not expect;evolution to proceed more quickly in a rapidly changing environment. Be sure to;address all five agents of evolutionary change in your response.;5. Explain why penicillin, once a widely used and;effective antibiotic, is now no longer effective against penicillin-resistant;bacteria.;6. We all know that bacteria are capable of causing serious;illnesses. Research has now shown that bacteria are helpful in many more ways;than had previously been known. How is your life influenced by helpful;bacteria?;7. Present your;view of the early conditions on earth that might have affected the traits of;organisms living in that environment and how life may have formed. Explain how;extremophiles represent examples of those organisms.;8. Viruses, prions and viroids are non-living organisms that;require a living cellular host in order to reproduce. They cannot do it on;their own. These parasites may be just a string of RNA, as in a viroid, or a;length of DNA enclosed in a protein shell, as in a virus.Is it possible that these parasites;may be links to the earliest days of the beginning of life on this planet?;Post your primary;response and support your statements with references.;Your primary post should be at least 125;words or so. Be sure to cite your;references in American Psychological Association (APA) style in-text and;include the full APA style reference information at the end of the document.


Paper#62569 | Written in 18-Jul-2015

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