Origin of life is a scientific problem which is not yet solved.Actually there are plenty of ideas,but a few are only clear facts.It is generally agreed that life today is formed by common descent from a single primitive lifeforms.No one this world those not know how the life is early formed ,but all the scientists concluded that they are formed by natural process which may be think ed to took palace about 3,900 million years ago.Scientists concluded to this because in accordance with a philosophy which is called as naturalism, that is which is occurred due to natural causes.While we are saying about out origin of life we also must say about spontaneous generation,then what is spontaneous generation is meant about until the 19th early century many scientist and many other peoples believed in the regular spontaneous generation of life from non-living matter.That is called as spontaneous generation,but the Louis Pasteur was disproved it later.Louis Pasteur showed that later that without spores that no bacteria or virus where grew on sterile materials.We also must say that while discussing origin of life we must also say that Joseph Dalton Hooker got a letter on 11th Feb 1871 in that he got that Charles Darwin proposed a natural process for origin of life.
Charles Darwin suggested that in 1873 that the original spark of life may have begun in a "Warm Little Pond"that must also consist of with all sort of ammonia,phosphoric salt,light,and heat etc.According to him a Protein compound was then chemically formed ready to undergo still more complex changes.He also doesn't forget to explain present days .He explained about present days such matters would be instantly devoured or absorbed,which was not has been the case before living creatures were formed or originated.
We must also consider HALDANE and OPARIN according to this no real progress was made until 1924 when Alexander oparin said that atmospheric oxygen prevent the synthesis of the organic molecules.Synthesis means combination of two or more entities that which together form something new,it also means or refer to the creating of something by artificial means. In evolution of life the organic molecules are too necessary building block or which also is an important factor.According to the Alexander the origin of life he argued that a "primeval soup"which has an no of organic molecules could be created in an oxygen-less atmosphere by the action of sunlight.and he said that these would combine in ever-more complex fashion until they are formed as droplets.And these droplets would grows up by the fusion that undergoes with the other droplets,which in turn and reproduce through the action of fission into daughter droplets,and which have a primitive metabolism in which the factors that promote "cell integrity"survive,and those do not become extinct. In modern theories also the Alexander oparin's idea is taken has a starting point.
And when around the same time J.B.S.Haldane where also suggested that the earth's pre-bio tic ocean's,which is to be very different that we see from todays ocean,In ocean would have formed a "HOT DILUTE SOUP".In which this soup,that is organic compounds,the building block of life,assumed to be could have been formed.This idea was called as the biopoiesis,the process of living matter evolving from self-replicating but nonliving molecules.This is to be considered as the evolution of life.
The origin of life from the evidences found that life on the earth existed for at least 3.5 billion years ago.In a National Institutes of Health study, the authors hypothesis that if biological complexity increased exponentially during evolution, life in the universe may have begun nearly 10 billion years ago- billions of years before the Earth existed, suggesting that Earth was seeded by panspermia or directed panspermia. All known life forms share fundamental molecular mechanisms, reflecting their common descent; based on these observations, hypotheses on the origin of life attempt to find a mechanism explaining the formation of a universal common ancestor, from simple organic molecules via pre-cellular life to protocells and metabolism. Models have been divided into "genes-first" and "metabolism-first" categories, but a recent trend is the emergence of hybrid models that combine both categories.This are sentences i have got while reading the origin.Living organisms synthesize proteins, which are polymers of amino acids using instructions encoded by deoxyribonucleic acid (DNA). Protein synthesis entails intermediary ribonucleic acid (RNA) polymers. One possibility for how life began is that genes originated first, followed by proteins; the alternative being that proteins came first and then genes.We know that genes and protein are both required to produce the other,for example consider whether the chicken or egg is firt produced.We know that chickens are produced from the egg that are formed by chickens.Most scientists have adopted the hypothesis that because of this, it is unlikely that genes and proteins arose independently.FRANCIS CRICK was the first one to suggest the first life was based on the RNA,which has got the DNA like properties of information storage and the catalytic property of the some of the proteins.which is know asthe RNA world hypothesis,and which is supported by the observation that the many of the critical components of cell are composed mostly or entirely of RNA. Also, many critical cofactors are either nucleotides or substances clearly related to them. The catalytic properties of RNA had not yet been demonstrated when the hypothesis was first proposed,but they were confirmed by Thomas Cech in 1986.
The origin of life from the evidences found that life on the earth existed for at least 3.5 billion years ago.In a National Institutes of Health study, the authors hypothesis that if biological complexity increased exponentially during evolution, life in the universe may have begun nearly 10 billion years ago- billions of years before the Earth existed, suggesting that Earth was seeded by panspermia or directed panspermia. All known life forms share fundamental molecular mechanisms, reflecting their common descent; based on these observations, hypotheses on the origin of life attempt to find a mechanism explaining the formation of a universal common ancestor, from simple organic molecules via pre-cellular life to protocells and metabolism. Models have been divided into "genes-first" and "metabolism-first" categories, but a recent trend is the emergence of hybrid models that combine both categories.This are sentences i have got while reading the origin.Living organisms synthesize proteins, which are polymers of amino acids using instructions encoded by deoxyribonucleic acid (DNA). Protein synthesis entails intermediary ribonucleic acid (RNA) polymers. One possibility for how life began is that genes originated first, followed by proteins; the alternative being that proteins came first and then genes.We know that genes and protein are both required to produce the other,for example consider whether the chicken or egg is firt produced.We know that chickens are produced from the egg that are formed by chickens.Most scientists have adopted the hypothesis that because of this, it is unlikely that genes and proteins arose independently.FRANCIS CRICK was the first one to suggest the first life was based on the RNA,which has got the DNA like properties of information storage and the catalytic property of the some of the proteins.which is know asthe RNA world hypothesis,and which is supported by the observation that the many of the critical components of cell are composed mostly or entirely of RNA. Also, many critical cofactors are either nucleotides or substances clearly related to them. The catalytic properties of RNA had not yet been demonstrated when the hypothesis was first proposed,but they were confirmed by Thomas Cech in 1986.
No comments:
Post a Comment