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originally posted by: TerraLiga
Is it not humility - a good Christian attitude - to say that you don’t know, rather than to arrogantly claim to know, which is not Christian at all.
originally posted by: TerraLiga
Is it not humility - a good Christian attitude - to say that you don’t know, rather than to arrogantly claim to know, which is not Christian at all.
originally posted by: Noinden
a reply to: Blue_Jay33
Simple Nucleic acids have been seen in space, and after simple experiments with basic atmospheres and electrical discharges.
Many scientists feel that life could arise by chance because of an experiment first conducted in 1953. In that year, Stanley L. Miller was able to produce some amino acids, the chemical building blocks of proteins, by discharging electricity into a mixture of gases that was thought to represent the atmosphere of primitive earth. Since then, amino acids have also been found in a meteorite. Do these findings mean that all the basic building blocks of life could easily be produced by chance?
“Some writers,” says Robert Shapiro, professor emeritus of chemistry at New York University, “have presumed that all life’s building blocks could be formed with ease in Miller-type experiments and were present in meteorites. [Noinden just demonstrated to have been affected by such writers, in spite of the reality that...] This is not the case.”2 *
Consider the RNA molecule. It is constructed of smaller molecules called nucleotides. A nucleotide is a different molecule from an amino acid and is only slightly more complex. Shapiro says that “no nucleotides of any kind have been reported as products of spark-discharge experiments or in studies of meteorites.”3 [no nucleotides = no nucleic acids; to use Noinden's terminology, nucleic acids like DNA and RNA of course being "constructed of ... nucleotides" as explained here; perhaps that's why Noinden said "simple Nucleic acids", to pretend that you can appropiately refer to something as a "nucleic acid" even when it's not made up of the rather complex nucleotides found in RNA and DNA and to claim that it's a (more) simple nucleic acid, creating or spreading ambiguity in language to capitalize on the ambiguity of language. The fact remains though that if you find no nucleotides “as products of spark-discharge experiments or in studies of meteorites” you have found no nucleic acids “as products of spark-discharge experiments or in studies of meteorites”, as Noinden claimed regarding spark-discharge experiments and "in space" (instead of meteorites). Of course the space claim is just as bogus; no nucleotides have been "seen in space" either. You can't even 'see' them with a telescope, with an electron microscope you can somewhat 'see' the double-helical structure of DNA; not very detailed though. Not to go too far off-topic, but as the article I just linked mentions: "The structure of DNA was originally discovered using X-ray crystallography. This involves X-rays scattering off atoms in crystallised arrays of DNA to form a complex pattern of dots on photographic film. Interpreting the images requires complex mathematics to figure out what crystal structure could give rise to the observed patterns.
The new images are much more obvious, as they are a direct picture of the DNA strands, albeit seen with electrons rather than X-ray photons." And then the verb "seeing" applies a bit better as well, but that wasn't my point, sorry for going off-track but I thought it might be useful to keep in mind when someone makes the claim that "Nucleic acids have been seen in space". The main point of this comment is to respond to the claim about nucleic acids from spark-discharge experiments though which Noinden described slightly differently.]
...
[besides]
RNA is required to make proteins, yet proteins are involved in the production of RNA. What if, despite the extremely small odds, both proteins and RNA molecules did appear by chance in the same place at the same time? How likely would it be for them to cooperate to form a self-replicating, self-sustaining type of life? “The probability of this happening by chance (given a random mixture of proteins and RNA) seems astronomically low,” says Dr. Carol Cleland *, a member of the National Aeronautics and Space Administration’s Astrobiology Institute. “Yet,” she continues, “most researchers seem to assume that if they can make sense of the independent production of proteins and RNA under natural primordial conditions, the coordination will somehow take care of itself.” Regarding the current theories of how these building blocks of life could have arisen by chance, she says: “None of them have provided us with a very satisfying story about how this happened.”6
Footnotes (*):
- Professor Shapiro does not believe that life was created. He believes that life arose by chance in some fashion not yet fully understood. In 2009, scientists at the University of Manchester, England, reported making some nucleotides in their lab. However, Shapiro states that their recipe “definitely does not meet my criteria for a plausible pathway to the RNA world.”
- Dr. Cleland is not a creationist. She believes that life arose by chance in some fashion not yet fully understood.
References:
2. Scientific American, “A Simpler Origin for Life,” by Robert Shapiro, June 2007, p. 48.
a. The New York Times, “A Leading Mystery of Life’s Origins Is Seemingly Solved,” by Nicholas Wade, May 14, 2009, p. A23.
3. Scientific American, June 2007, p. 48.
6. NASA’s Astrobiology Magazine, “Life’s Working Definition—Does It Work?” (http://www.nasa.gov/vision/universe/starsgalaxies/life’s_working_definition.html), accessed 3/17/2009.
Simple Nucleic acids have been seen in space, and after simple experiments with basic atmospheres and electrical discharges.
Many scientists feel that life could arise by chance because of an experiment first conducted in 1953. In that year, Stanley L. Miller was able to produce some amino acids, the chemical building blocks of proteins, by discharging electricity into a mixture of gases that was thought to represent the atmosphere of primitive earth.
How Did RNA & DNA Come Into Existence ?
originally posted by: 57ORM1IV
Check my post... thoughts?
originally posted by: cooperton
originally posted by: 57ORM1IV
Check my post... thoughts?
The thing is, RNA polymerization is a non-spontaneous reaction. This means it requires energy, and it also requires protein enzymes to be made from a DNA template:
^this is how prokaryotes (bacteria) create RNA strands. This also takes for granted that RNA monomers are available to polymerize. Even if, against all odds, a long RNA chain was created at random that managed to code for a coherent protein, it still would need proteins (enzymes) to be able to parse the data and make anything worthwhile from it. But functional proteins don't exist yet because there is no way for RNA to be made into proteins...
There are many more hurdles but that's the most straight-forward problem that shows nucleic acid chains could not have formed by random chance