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Write the Oparin and Haldane hypothesis ...

Write the Oparin and Haldane hypothesis about the origin of life on Earth. How does meteorite analysis favour this hypothesis?

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Oparian and Haldane proposed that the first form of life could have come from pre-existing non-living organic molecules leg. RNA, protein eye.) and that formation of life preceded by chemical evolution, Le, formation of diverse organic molecules from inorganic constituents. Meteorites are hypothesised to be another source for early organic molecules as meteorite content contains some similar organic components as found in early earth's atmosphere. The stony meteorites are well known to contain rich mix of organic compounds. This analysis of meteorite content indicates that similar processes are occurring elsewhere in space
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In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants synthesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. C-14 exists in atmosphere due to:

TRUEMAN BIOLOGY-GENETICS AND EVOLUTION -SECTION-A
  1. Write the Oparin and Haldane hypothesis about the origin of life on Ea...

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  2. Which Mendel's law of inheritance is universally acceptable and withou...

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  3. Name the parts 'A' and 'B' of the transcription unit given below.

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  4. Name the components 'a' and 'b' in the nucleotide with a purine, given...

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  5. Why hnRNA is required to undergo splicing?

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  6. State any one reason to explain why RNA viruses mutate and evolve fast...

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  7. How is the length of DNA usually calculated?

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  8. How does HIV differ from bacteriophage?

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  9. The gene I that controls the ABO blood grouping in human beings has t...

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  10. Provide one word or one sentence information about 'plasmid' with resp...

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  11. Name the event during cell division that results in the gain or loss o...

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  12. Mention the contribution of genetic maps in human genome project.

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  13. Name one autosomal dominant and one autosomal recessive. Mendelian dis...

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  14. A human being suffering from Down's Syndrome shows trisomy of 21^(st) ...

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  15. A pedigree chart given here, presents a particular generation which sh...

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  16. In order to obtain the F(1)-generation Mendel pollinated a pure-breedi...

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  17. "Genes contain the information that is required to express a particula...

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  18. How are alleles of particular gene differ from each other? Explain its...

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  19. For the experssion of traits genes provide only the potentiality and t...

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  20. A, B, D are three independently assorting genes with their recessive a...

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  21. Sometimes cattle or even humen beings give birth to their young ones t...

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