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The interphase has highly extended and e...

The interphase has highly extended and elaborate nucleoprotein fibres called:-

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chromatin
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An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

ALLEN -CELL : THE UNIT OF LIFE-Nucleus
  1. The interphase has highly extended and elaborate nucleoprotein fibres ...

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  2. What is the name of basic protein present in chromatin?

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  3. What is the approximate length of DNA in a single human cell?

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  4. Which constriction is essentially present in every chromosome?

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  5. Other name of primary constriction is

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  6. Sometimes a few chromosomes have non staining secondary constriction a...

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  7. Nucleus was first described by:-

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  8. Chromatin name was give by:-

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  9. Space between the two parallel membrances of nucleus is called:-

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  10. The outer membrane of nucleus usually remains continuous with which ce...

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  11. Nucleolus is a main site for synthesis of:-

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  12. Give the name of two matrue eukaryotic cells that lack nucleus:-

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  13. Diameter of space between two parallel membrances of nucleus is:-

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  14. The spherical structure present in the nucleoplasm is:

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  15. Metacentric, submetacentric, telocentric and acrocentric chromosomes a...

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  16. Name the type of chromosome which has a terminal centromere:-

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  17. In which chromosome the centromere is situated close to its end formin...

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  18. In which chromosome, centromere is situated middle of chromosome and f...

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  19. Nucleus controls the activities of organelles and play a major role in...

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  20. Material of the nucleus is stained by only acidic dye

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