| | DNA: The Design is in the Details In part one I described how Miller’s attempts to produce the essential building blocks of life in the laboratory failed because, even though Miller did succeed in producing amino acids, the ones he produced were of the wrong variety. Miller’s experiment produced the right-handed variety (dextro) while the amino acids necessary to yield life are of the left-handed variety (levo). Moreover, Miller's experiment also produced several organic acids which would have destroyed the amino acids he created long before they formed a protein. To prevent this from happening, Miller had to use a “cold trap” to isolate the amino acids from the organic acids as soon as they were formed. In other words, the only reason the amino acids survived was due to the intelligent intervention of Miller. But let us assume for the moment that Miller had succeeded in creating the right kind of amino acids needed to yield life. And let us further assume that he was able to produce them without the organic acids that would have instantaneously destroyed them. Would it then have been possible for the amino acids to link up together and form the first functional protein necessary to sustain a living cell? The answer is a resounding NO. This is because the more difficult problem that abiogenesis faces has yet to even be discussed: information. What must be explained is not only how the organic building blocks of life can be created via natural processes, but the source of information that properly assembled those building blocks to form the first life form. Paul Davies summed up this obstacle for abiogenesis well by employing the metaphor of building a house: "Making the building blocks of life is easy—amino acids have been found in meteorites and even in outer space. But just as bricks alone don’t make a house, so it takes more than a random collection of amino acids to make life. Like house bricks, the building blocks of life have to be assembled in a very specific and exceedingly elaborate way before they have the desired function" Let us consider another example. A novel is composed of letters which combine to form sentences, which in turn, combine to form paragraphs. But if these letters were not ordered in the exact way that they are, they would appear nonsensical to us. Consider the following sequence of letters: MIET NDA DTIE ATIW RFO NO NMA. Doesn’t make much sense does it. That’s because while the sequence is complex, it is not specified. In other words, the letters do not conform to any independently-given pattern. But suppose we were to re-arrange the letters in the following way: TIME AND TIDE WAIT FOR NO MAN. Suddenly the same letters convey a message to our brains. The first sequence is complex but is not specified. The second sequence is both complex and specified. Systems that are characterized by both specificity and complexity have what we call "information content." That is, they have the ability to transmit information to intelligent agents. Scientists have found that the same is true of the coded information found in human DNA. In 1953, James Watson and Francis Crick elucidated the structure of the DNA molecule. By now most people are familiar with the double helix structure of the DNA molecule. It is like a long ladder, twisted into a spiral. Molecular biologists have discovered how DNA stores the information necessary to direct protein synthesis. It was Crick who first proposed the "sequence hypothesis". According to the sequence hypothesis, information on the DNA molecule is stored in the form of specifically arranged chemicals called nucleotide bases along the spine of DNA’s helical strands. Chemists represent these four nucleotides with the letters A, T, G, and C (for adenine, thymine, guanine, and cytosine). By 1961, a series of brilliant experiments confirmed DNA’s information-bearing properties. The amount of information in the DNA is so vast that it led Oxford biologist Richard Dawkins to claim that the amount of information in just a single strand of DNA would fill up 1,000 Enclyclopedia Brittanicas! The DNA molecule is exquisitely complex, but in addition to its complexity, it is also specified. Like the above sequence of letters, the 'letters' in DNA must be in a very precise sequence. If they are out of order then the information that the DNA transmits to the cell is garbled and will lead to a loss of cellular function. To summarize, the information found within DNA is both complex and specified. Hence, scientists have come to refer to it as “specified complexity”. But how does all this lead one to the conclusion of design? Well, first of all no natural processes are known to produce structures with high information content like that found in DNA. Furthermore, if we consult everyday experience, we readily note that objects with a high information content such as books, computer programs, and musical scores are always the result of an intelligent source. For example, if you were to trace the information on your computer screen back to its original source you would invariably come to a mind--that of a software engineer or programmer. As Bill Gates has noted, "DNA is like a computer program, but far, far more advanced than any software we've ever created." Moreover, it is important to note that this is not just a case of reasoning by analogy. It is more than an analogy. In fact, in terms of structure, the two are virtually identical. All this leads us to one inevitable conclusion. If the information content found in human language and computer language is always the result of an intelligent designer, then it is only logical to conclude that the information content found in DNA is also the result of an intelligent designer. NOTE TO READER: This post can also be found on our group site: Alliance Against Methodological Naturalism. |