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Stanley L Miller conducted experiments b...

Stanley L Miller conducted experiments befor 1953 on prebiotic earth environment using special apparatus. The primary surprising products wee

A

Peptides

B

Amino acids

C

nucleotides

D

Simple sugars

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The correct Answer is:
B
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Stanley Miller conducted experiments in 1953 on prebiotic Earth environment using special apparatus. The primary surprising products were:

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Stanley Lloyd Miller a graduate student of Harold C. Urey, Conducted an experiment to demonstrate that simple organic molecules like amino acids could be produced if an electric discharge is passed through a mixture of such gases as might have been present in the atmosphere of the early earth. The gaseous mixture used in the experiment comprised

Mankind's experience of various evolutionary changes from primitive times to the present day has been extensive and varied. However, man's problems were never before as complicated as they seem to be today, Man's economic activity centres primarily around production, Labour is said to be the primary factor of production, its role, therefore, has been given a lot of importance. It should be useful to have an overall view of the economic history of man-from the nomadic times to the modern factory system and study its relevance to the various labour problems of today. Initially, man passed through the hunting and fishing stage'. During this period, his basic needs were adequately met by Nature. Wild animals, birds and fruits satisfied his hunger, and his thirst was quenched by the waters of springs and rivers, Caves gave him shelter and barks of trees were used as clothing. During this stage of man's progress, labour problems did not exist because of the absence of any economic, political and social systems. Then came the pastoral stage', which was marked by a certain amount of economic activity. The nomadic and migratory nature of man persisted, and, together with his goats and cattle, he moved on to fresh pastures and meadows. Some conflicts would sometimes take place among herd-owners, for, during this period, the institution of nominal private property ownership was not known. This stage paves the way for the agricultural stage', during which the class system began to develop. There was a small artisan class mostly self-employed, and there were also landed proprietors or Zamindars as well as slaves. Thus, arose the feudal system. During the fourth stage of these developments, the handicrafts stage', a number of social and economic changes took place which marked the beginning of the labour problem in the world. The self-sufficient economy of the village underwent a drastic change. The community of traders and merchants emerged. ."man's problems were never before as complicated as they seem to be today" means

ARIHANT NEET-ORIGIN OF LIFE-Chapter Exercises Taking it together (A) (Assorted Questions of the Chapter for Advanced Level Practise)
  1. What prokaryotic adaptation accurred during the oxygen revolution and ...

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  2. Amino acids and polynucleotides similar to DNA was found in Mighi Mete...

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  3. Stanley L Miller conducted experiments befor 1953 on prebiotic earth e...

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  4. Most probably now, no origin of life is taking place in the way as occ...

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  5. The discovery of virus has placed the problemof the origin of life in ...

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  6. Which of the following statements does not explain the usefulness of s...

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  7. The heterotrophic hypothesis helps us to understand

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  8. In Spallanzani's experiment, one set of flasks had access to air throu...

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  9. Biologists believe that the current DNAtoRNAtoProtein system is the re...

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  10. Which of the Following discoveries would force scientists to revise th...

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  11. Temperature in the interior of the sun is 200000000^(@) C, the reason ...

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  12. Pasteur's experiments and similar ones that followed convinced most pe...

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  13. Mark the correct statement.

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  14. In the ancient atmosphere, free nitrogen, exygen and carbon dioxide we...

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  15. An evolving coacervate- like system would have needed a controlled and...

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  16. In What respect, the heterotroph hypothesis differs from the early ide...

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  17. Which of the following is a true statement?

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  18. Which of these is a true statement?

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  19. In primordial atmosphere, when the living organism cvolved the respira...

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  20. Which of the following is a factor against the theory of panspermia?

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