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Evolution Cannot Explain Left-Handed Molecules
28.08.2008 Source: Pravda.Ru
URL:
http://english.pravd...ded_Molecules-0
By Babu G. Ranganathan
Millions of high school and college biology textbooks imply that
Stanley Miller, in the 1950's, showed that life could arise by chance.
Nothing could be further from the truth.
Miller, in his famous experiment in 1953, showed that individual amino
acids (the building blocks of life) could come into existence by
chance. But, it's not enough just to have amino acids. The various
amino acids that make-up life must link together in a precise
sequence, just like the letters in a sentence, to form functioning
protein molecules. If they're not in the right sequence the protein
molecules won't work. It has never been shown that various amino acids
can bind together into a sequence by chance to form protein molecules.
Even the simplest cell is made up of many millions of various protein
molecules.
Also, what many don't realize is that Miller had a laboratory
apparatus that shielded and protected the individual amino acids the
moment they were formed, otherwise the amino acids would have quickly
disintegrated and been destroyed in the mix of random energy and
forces involved in Miller's experiment.
There is no innate chemical tendency for the various amino acids to
bond with one another in a sequence. Any one amino acid can just as
easily bond with any other. The only reason at all for why the various
amino acids bond with one another in a precise sequence in the cells
of our bodies is because they're directed to do so by an already
existing sequence of molecules found in our genetic code.
In Nature there are what scientists call right-handed and left-handed
amino acids. However, life requires that all proteins be left-handed.
So, not only do millions of amino acids have to be in the correct
sequence, they also all have to be left-handed. If a right-handed
amino acid gets mixed in then the protein molecules won't function.
There won't be any life!
Similarly, the nucleic acids in DNA and RNA must be in a precise
sequence. The sugar molecules that make-up the various nucleic acids
in DNA and RNA must be right-handed. If a nucleic acid with a
left-handed sugar molecule gets into the mix then nothing will work.
If the cell had evolved it would have had to be all at once. A
partially evolved cell cannot wait millions of years to become
complete because it would be highly unstable and quickly disintegrate
in the open environment, especially without the protection of a
complete and fully functioning cell membrane. And even having a
complete cell doesn't necessarily mean there will be life. After all,
even a dead cell is complete shortly after it dies!
Of course, once there is a complete and living cell then the genetic
code and other biological mechanisms exist to direct the formation of
more cells. The question is how could life have arisen naturally when
there was no directing mechanism at all in Nature.
The great British scientist Sir Frederick Hoyle has said that the
probability of the sequence of molecules in the simplest cell coming
into existence by chance is equivalent to a tornado going through a
junk yard of airplane parts and assembling a 747 Jumbo Jet!
Thanks to popular evolutionist writers like Richard Dawkins, many in
society have come to believe that natural selection will solve all of
evolution's problems.
Natural selection cannot produce anything. It can only "select" from
what is produced. Furthermore, natural selection operates only once
there is life and not before.
Evolutionists believe that chance mutations in the genetic code will
produce increasingly more complex genes for natural selection to use
so that life can evolve from simpler species to more complex ones.
There is no evidence that chance mutations can or will provide
increasingly more complex genes for natural selection to act upon so
that evolution would be possible from simpler species to more complex
ones. It's like saying that the random changes caused by an earthquake
will increase the complexity of houses and buildings!
Natural selection is not an active force. It is a passive process in
Nature. Only those variations that have survival value will be
"selected" or be preserved. Once a variation has survival value then,
of course, it's not by chance that it is "selected". But, natural
selection, itself, does not produce or design those biological
variations. The term "natural selection" is simply a figure of speech.
Nature does not do any active or conscious selecting. It is an
entirely passive process. "Natural selection" is just another way of
saying "natural survival". If a biological change occurs that helps a
species to survive then that species, obviously, will survive (i.e. be
"selected"). Natural selection can only "select" from biological
variations that are possible in a species.
In the midst of arguments over evolution and intelligent design, it is
amazing how many in society, including the very educated, believe that
scientists had already created life in the laboratory. No such thing
has ever happened.
All that scientists have done is genetically engineer already existing
forms of life in the laboratory, and by doing this scientists have
been able to produce new forms of life, but they did not produce these
new life forms from non-living matter. Even if scientists ever do
produce life from non-living matter it will only be through
intelligent design or planning so it still wouldn't help support any
theory of life originating by chance or evolution.
Even artificial, or synthetic life, is a creation by scientists,
through intelligent design, of a DNA code built from "scratch" which
is then inserted into an already existing living cell.
There simply is no scientific basis for believing life could have
arisen by chance processes even if given the right environmental
conditions to sustain life. What if we should discover life on Mars?
Even if we should discover life on Mars it wouldn't prove that such
life originated by chance. Also, if we do find evidence of life on
Mars it would have most likely have come from our very own planet -
Earth! In the Earth's past there was powerful volcanic activity which
could have easily spewed rock and dirt containing microbes into outer
space much of which eventually could have reached Mars. A Newsweek
article of September 21, 1998, p.12 mentions exactly this possibility.
"We think there's about 7 million tons of earth soil sitting on Mars",
says scientist Kenneth Nealson. "You have to consider the possibility
that if we find life on Mars, it could have come from the Earth"
[Weingarten, T., Newsweek, September 21, 1998, p.12].
This would also explain, as MIT scientist Dr. Walt Brown has pointed
out, why some meteorites contain organic compounds because they are
remnants of the original debris spewed from the Earth due to very
fierce ancient geological disturbances and activity.
Natural laws are adequate to explain how the order in life, the
universe, and even a microwave oven operates, but mere undirected
natural laws cannot fully explain the origin of such order.
The best little article ever written refuting the origin of life by
chance is "A Few Reasons an Evolutionary Origin of Life Is Impossible"
by scientist and biochemist Dr. Duane T. Gish. Dr. Gish presents
"simple" but profound scientific barriers to evolution of life which
aren't mentioned or covered in Johnny's high school biology textbook
or in college textbooks for that matter. This article is truly great!
Dr. Gish's aricle may be accessed at:
http://icr.org/article/3140/ .
All this simply means that real science supports faith in an
intelligent Designer behind the origin of life and the universe. It is
only fair that evidence supporting intelligent design be presented to
students alongside of evolutionary theory.
Science cannot prove that we're here by either chance or design. Both
require faith. Where will you place your faith?
A Few Reasons an Evolutionary Origin of Life Is Impossible
http://www.icr.org/article/3140/
by Duane Gish, Ph.D.*
There were no human witnesses to the origin of life, and no physical
geological evidence of its origin exists. Speaking of the origin of a
hypothetical self-replicating molecule and its structure, Pross has
recently admitted that "The simple answer is we do not know, and we
may never know."1 Later, concerning the question of the origin of such
a molecule, Pross said, ". . . one might facetiously rephrase the
question as follows: given an effectively unknown reaction mixture,
under effectively unknown reaction conditions, reacting to give
unknown products by unknown mechanisms, could a particular product
with a specific characteristic . . . have been included amongst the
reaction products?"2 That pretty well summarizes the extent of the
progress evolutionists have made toward establishing a mechanistic,
atheistic scenario for the origin of life after more than half a
century of physical, chemical, and geological research. It is
possible, however, to derive facts that establish beyond doubt that an
evolutionary origin of life on this planet would have been impossible.
The origin of life could only have resulted from the action of an
intelligent agent external to and independent of the natural universe.
There is sufficient space here to describe only a few of the
insuperable barriers to an evolutionary origin of life.
1. The absence of the required atmosphere.
Our present atmosphere consists of 78% nitrogen (N2), 21% molecular
oxygen (O2), and 1% of other gases, such as carbon dioxide CO2), argon
(Ar), and water vapor H2O). An atmosphere containing free oxygen would
be fatal to all origin of life schemes. While oxygen is necessary for
life, free oxygen would oxidize and thus destroy all organic molecules
required for the origin of life. Thus, in spite of much evidence that
the earth has always had a significant quantity of free oxygen in the
atmosphere,3 evolutionists persist in declaring that there was no
oxygen in the earth's early atmosphere. However, this would also be
fatal to an evolutionary origin of life. If there were no oxygen there
would be no protective layer of ozone surrounding the earth. Ozone is
produced by radiation from the sun on the oxygen in the atmosphere,
converting the diatomic oxygen(O2) we breathe to triatomic oxygen O3),
which is ozone. Thus if there were no oxygen there would be no ozone.
The deadly destructive ultraviolet light from the sun would pour down
on the surface of the earth unimpeded, destroying those organic
molecules required for life, reducing them to simple gases, such as
nitrogen, carbon dioxide, and water. Thus, evolutionists face an
irresolvable dilemma: in the presence of oxygen, life could not
evolve; without oxygen, thus no ozone, life could not evolve or exist.
2. All forms of raw energy are destructive.
The energy available on a hypothetical primitive Earth would consist
primarily of radiation from the sun, with some energy from electrical
discharges (lightning), and minor sources of energy from radioactive
decay and heat. The problem for evolution is that the rates of
destruction of biological molecules by all sources of raw energy
vastly exceed their rates of formation by such energy. The only reason
Stanley Miller succeeded in obtaining a small amount of products in
his experiment was the fact that he employed a trap to isolate his
products from the energy source.4 Here evolutionists face two
problems. First, there could be no trap available on a primitive
Earth. Second, a trap by itself would be fatal to any evolutionary
scenario, for once the products are isolated in the trap, no further
evolutionary progress is possible, because no energy is available. In
his comments on Miller's experiment, D. E. Hull stated that "These
short lives for decomposition in the atmosphere or ocean clearly
preclude the possibility of accumulating useful concentrations of
organic compounds over eons of time. . . . The physical chemist guided
by the proved principles of chemical thermodynamics and kinetics,
cannot offer any encouragement to the biochemist, who needs an ocean
full of organic compounds to form even lifeless coacervates."5
3. An evolutionary scenario for the origin of life would result in an
incredible clutter.
Let us suppose that, as evolutionists suggest, there actually was some
way for organic, biologically important molecules to have formed in a
significant quantity on a primitive Earth. An indescribable mess would
have been the result. In addition to the 20 different amino acids
found in proteins today, hundreds of other kinds of amino acids would
have been produced. In addition to deoxyribose and ribose, the
five-carbon sugars found in DNA and RNA today, a variety of other
five-carbon sugars, four-carbon, six-carbon, and seven-carbon sugars
would have been produced. In addition to the five purines and
pyrimidines found in DNA and RNA today, a great variety of other
purines and pyrimidines would exist. Further, of vital significance,
the amino acids in proteins today are exclusively left-handed, but all
amino acids on the primitive Earth would be 50% left-handed and 50%
right-handed. The sugars in DNA and RNA today are exclusively
right-handed, but, if they did exist, sugars on a primitive Earth
would have been 50% right-handed and 50% left-handed. If just one
right-handed amino acid is in a protein, or just one left-handed sugar
is found in a DNA or RNA, all biological activity is destroyed. There
would be no mechanism available on a primitive Earth to select the
correct form. This fact alone destroys evolution. Evolutionists have
been wrestling with this dilemma since it was first recognized, and
there is no solution in sight. All these many varieties would compete
with one another, and a great variety of other organic molecules,
including aldehydes, ketones, acids, amines, lipids, carbohydrates,
etc. would exist. If evolutionists really claim to simulate plausible
primitive Earth conditions, why don't they place their reactants in a
big mess like this and irradiate it with ultraviolet light, shock it
with electric discharges, or heat it, and see what results? They don't
do that because they know there wouldn't be the remotest possibility
that anything useful for their evolutionary scenario would result.
Rather, they carefully select just the starting materials they want to
produce amino acids or sugars or purines or whatever, and,
furthermore, they employ implausible experimental conditions that
would not exist on a primitive Earth. They then claim in textbooks and
journal articles that such and such biological molecules would have
been produced in abundant quantities on the early earth.
4. Micromolecules do not spontaneously combine to form macromolecules.
It is said that DNA is the secret of life. DNA is not the secret of
life. Life is the secret of DNA. Evolutionists persistently claim that
the initial stage in the origin of life was the origin of a
self-replicating DNA or RNA molecule. There is no such thing as a
self-replicating molecule, and no such molecule could ever exist.The
formation of a molecule requires the input of a highly selected type
of energy and the steady input of the building blocks required to form
it. To produce a protein, the building blocks are amino acids. For DNA
and RNA these building blocks are nucleotides, which are composed of
purines, pyrimidines, sugars, and phosphoric acid. If amino acids are
dissolved in water they do not spontaneously join together to make a
protein. That would require an input of energy. If proteins are
dissolved in water the chemical bonds between the amino acids slowly
break apart, releasing energy (the protein is said to hydrolyze). The
same is true of DNA and RNA. To form a protein in a laboratory the
chemist, after dissolving the required amino acids in a solvent, adds
a chemical that contains high energy bonds (referred to as a peptide
reagent). The energy from this chemical is transferred to the amino
acids. This provides the necessary energy to form the chemical bonds
between the amino acids and releases H and OH to form H2O (water).
This only happens in a chemistry laboratory or in the cells of living
organisms. It could never have taken place in a primitive ocean or
anywhere on a primitive Earth. Who or what would be there to provide a
steady input of the appropriate energy? Destructive raw energy would
not work. Who or what would be there to provide a steady supply of the
appropriate building blocks rather than just junk? In speaking of a
self-replicating DNA molecule, evolutionists are reaching for a pie in
the sky.
5. DNA could not survive without repair mechanisms.
DNA, as is true of messenger-RNA, transfer-RNA, and ribosomal-RNA, is
destroyed by a variety of agents, including ultraviolet light,
reactive oxygen species, alkylting agents, and water. A recent article
reported that there are 130 known human DNA repair genes and that more
will be found. The authors stated that "Genome |DNA| instability
caused by the great variety of DNA-damaging agents would be an
overwhelming problem for cells and organisms if it were not for DNA
repair emphasis mine)."6 Note that even water is one of the agents
that damages DNA! If DNA somehow evolved on the earth it would be
dissolved in water. Thus water and many chemical agents dissolved in
it, along with ultraviolet light would destroy DNA much faster than it
could be produced by the wildest imaginary process. If it were not for
DNA repair genes, the article effectively states, DNA could not
survive even in the protective environment of a cell! How then could
DNA survive when subjected to brutal attack by all the chemical and
other DNA-damaging agents that would exist on the hypothetical
primitive Earth of the evolutionists?
What are the cellular agents that are necessary for DNA repair and
survival? DNA genes! Thus, DNA is necessary for the survival of DNA!
But it would have been impossible for DNA repair genes to evolve
before ordinary DNA evolved and it would have been impossible for
ordinary DNA to evolve before DNA repair genes had evolved. Here we
see another impossible barrier for evolution. Furthermore, it is
ridiculous to imagine that DNA repair genes could have evolved even if
a cell existed. DNA genes encode the sequences of the hundreds of
amino acids that constitute the proteins that are the actual agents
that are involved in DNA repair. The code in the DNA is translated
into a messenger RNA (mRNA). The mRNA must then move to and be
incorporated into a ribosome (which is made up of three different
ribosomal RNAs and 55 different protein molecules). Each amino acid
must be coupled to a transfer RNA specific for that amino acid, and
the coupling requires a protein enzyme specific for that amino acid
and transfer-RNA. Responding to the code on the messenger RNA and
utilizing the codes on transfer RNA's, the appropriate amino acids,
attached to the transfer RNAs, are attached to the growing protein
chain in the order prescribed by the code of the messenger RNA. Many
enzymes are required along with appropriate energy. This is only a
brief introduction to the incredible complexity of life that is found
even in a bacterium.
"Who knoweth not in all these that the hand of the Lord hath wrought
this?" (Job 12:9).
Endnotes
1. Pross, Addy. 2004. Causation and the origin of life. Metabolism
or replication first? Origins of Life and Evolution of the Biospheres
34:308.
2. Ibid., 316.
3. Davidson, C. F. 1965. Geochemical aspects of atomospheric
evolution. Proc. Nat. Acad. Sci. 53:1194; Brinkman, R. T., 1969.
Dissociation of water vapor and evolution of oxygen in the terrestrial
atmosphere. J. Geophys. Res., 74:5355; Clemmey, H., and N. Badham.
1982. Oxygen in the Precambrian atmosphere; an evaluation of the
geological evidence. Geology 10:141; Dimroth, E., and M. M. Kimberley.
1976. Precambrian atmospheric oxygen: evidence in the sedimentary
distributions of carbon, sulfur, uranium, and iron. Can. J. Earth
Sci., 13:1161.
4. Miller, Stanley. 1953. A production of amino acids under
possible primitive earth conditions. Science 117:528.
5. Hull, D. E. 1960. Thermodynamics and kinetics of spontaneous
generation. Nature 186:693.
6. Wood, R. D., et al. 2001. Human DNA repair genes. Science 291:1284.
*Dr. Duane Gish is Senior Vice President Emeritus of ICR.
Cite this article: Gish, D. 2007. A Few Reasons an Evolutionary Origin
of Life Is Impossible. Acts & Facts. 36 (1).
This should settle the argument once and for all!
Edited by Jaguiar, 29 August 2011 - 01:34 AM.