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A scientist was studying an in vitro eu...

A scientist was studying an in vitro euckaryotic transcription system, which produced both capped and uncapped mRNAs. For an experiment, he incubated these mRNAs with mammalian cell nuclear extract and quantified the different products as shown . Which of the following graphs represents the expected result correctly ?

A

B

C

D

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The correct Answer is:
d
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Mitaali, a class 10 student wanted to study the speed of reactions of different acids with zinc metal. For this, she conducted the following experiments using zinc metal in excess. She measured the volume of H_2 gas produced at regular time intervals and summarised her results in a graphical form. Which of the following graphs best represents the results obtained in experiments I, II and III?

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Which is not true with respect to cathode rays?

NCERT FINGERTIPS-MOLECULAR BASIS OF INHERITANCE-Molecular Basis Of Inheritance
  1. Arrange the various steps of DNA fingerprinting technique in the corre...

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  2. Match column I with II column II and select the correct option from th...

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  3. A scientist was studying an in vitro euckaryotic transcription system...

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  4. A DNA template plus primer with the structure (where =a phosphate grou...

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  5. C-value is the characteristic DNA content in a haploid cell of a given...

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  6. The DNA fingerprinting analysis analysis of four family members is sh...

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  7. An organism uses 20 amino acids while its DNA is made up of 6 types of...

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  8. The semi-conservative nature of DNA replication was established by Me...

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  9. You have created a fusion between trp operon and lac operon which enco...

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  10. A DNA sequence undergoes three subsequent point mutations which result...

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  11. In a DNA strand the nucleotides are linked together by

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  12. A nucleoside differs from a nucleotide. It lacks the

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  13. Both deoxyribose and ribose belong to a class of sugars called

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  14. The fact that a purine base always paired through hydrogen bonds with ...

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  15. The net electric charge on DNA and histones is

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  16. The promoter site and the terminator site for transcription are locate...

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  17. Which of the following statement is the most appropriate for sickle c...

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  18. One of the following is true with respect to AUG

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  19. The first genetic material could be

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  20. With regard to mature mRNA in eukaryotes

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