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¶ … Origin of Life
When Watson and Crick discovered DNA, double nucleotide chains containing the "language" of life, scientists had new information on which to base further research about the way living cells function and, in turn, the origins of life. In a 2007 article for Scientific American, Robert Shapiro explains why Watson and Crick's discovery did not provide the definitive answer to one of science's most provocative questions, as scientists had hoped.
One of the major problems to be resolved in discovering the origin of life is akin to the age-old question about which came first, the chicken or the egg. The discovery of RNA seemed to provide a plausible explanation. RNA, a class of molecules, carries information from DNA to cell structures. Scientists were poised to accept that RNA was the self-replicating molecule providing the catalyst for life. The question still remained: how did the first RNA arise? The spontaneity required for self-replication to suddenly take place goes well beyond scientific inquiry, some argue, and into the realm of improbability....
The group of scientists who believe in the replicator model have yet to show how a complex molecule could have formed initially. There are theories that certain compounds joined together by chance to form a molecule that could somehow self-replicate. Through an evolutionary process, the molecules mutated and adapted, eventually forming more complex organisms in which different parts performed different functions. The diagram provided by Shapiro shows, disorganized molecules organize into chains that mutate, surviving a selection process, and eventually organizing into organisms with compartments. As stated, this scenario is still considered theoretical; scientists have not established proof.
Likewise, proof does not exist the alternative theory of metabolism first, which holds that "compartmentalized" organisms formed spontaneously; particular compartments were capable of the kind of functions necessary to generate reaction networks leading to growth and evolution.
Shapiro outlines five truths that must be accommodated in any explanation about…
Origin of HIV The mystery of HIV and its origins is one that cannot be easily solved. In the thirty-odd years which have passed since the official recognition of AIDS by the CDC and the subsequent search for its cause, various theories have been floated regarding its nature, its development, its ability to adapt, our ability to combat it, and -- most importantly for some -- its origin. How did the
Women identified their Christ Jesus who was food during mass as the redemption of humanity. The women believed reaching spirituality was through food, since naturally they were food from their ability to breastfeed. The Medieval women associated the breast as seen in Holy mother, Mary's own breastfeeding as a Eucharistic feeding of the soul. The painting also indicates that to the Female saints of the Middle Ages, prayer was an important
Life Coaches Hi! My name is Jane and I will be your personal life coach. Thank you for choosing me. I know you have a choice in life coaches, with over 12,000 of us worldwide (Pawlowski, 2007, p. 1). Now, I would like to introduce myself further and let you know what I can do for you. I became a life coach five years ago, after experiencing a personal crisis of
("SETI Institute," 2007) So the future holds bright to understanding more about life on Mars. References Berger, Brian. (2005, Feb) "Exclusive: NASA Researchers Claim Evidence of Present Life on Mars" Retrieved 12 December, 2007 from: http://www.space.com/scienceastronomy/mars_life_050216.html Dasch, Pat; Treiman, Allan. (2007) "Ancient Life on Mars" Lunar and Planetary Institute. Retrieved 12 December, 2007 from: http://www.lpi.usra.edu/publications/slidesets/marslife/ Davidson, Jim. (1996, Dec) "Life on Mars: You Call This Life?" Retrieved 12 December, 2007 from http://www.houstonspacesociety.org/life.html Hamilton, Calvin. J.
In the Gospel of Luke, it cites that Jesus came to Nazareth and according to tradition entered into the synagogue on the sabbath day and read from Isaiah, and throughout the gospel notes that Jesus "preached in the synagogues of Glalilee" (Luke pp 98). According to Kerry Shirts, synagogues "are mentioned among both Nephites and the Lamanites under dissident Nephite influence (Alma 21:4-5; 32:1-12; Helaman 3:9, 14; Moroni 7:1)" (Shirts
In the 19th century, the idea and definition of rights was extended by calls for social and economic rights that came on the tail of rapid industrialization. This new era of rights was based upon the utilitarian idea of obtaining the greatest good for the greatest number of people. This included a discussion of property ownership, both private and common, and the ideas of public of rights and private responsibility