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X- Rays cause mutation by...

X- Rays cause mutation by

A

Breaking spindle fibers

B

Rupturing nuclear evenlope

C

Changing chromosome morphology

D

Inhibiting cytokinesis

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The correct Answer is:
C
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X-ray are emitted by a tube containing the electron gt Noibum (Z = 41) as anticathode and the K_(alpha) X-ray an allowed to be incident on an unknown gas containing hydrogen- like atom ions. It is found that the X-ray cause the emission of photoelectrons with an energy of 2.7 keV from these ions. Find a. the minimum voltage at which the X-ray tube should be opreated so that the momentum of the emitted photoelectrons is doubled. b. the approximate value of Z for the target of the anticathode after the momentum has been doubled. c. the approximate value of Z the atomic number of the atom of the gas. d. the number of the ion produced in the gas caused by X-ray , if the inetensity of X-ray is 100 mWm^(-2) and 1% of the X-rays cause ionization.

Why do X-rays and gamma rays induce mutations?

ALLEN-GENETICS & MOLECULAR BASIS OF INHERITANCE AND MUTATION-EXERCISE-I (CONCEPTUAL QUESTIONS)
  1. To be evolution of successful, a mutation must occur in

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  2. Chemical mutagens are far more harzardous than radiations because :-

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  3. X- Rays cause mutation by

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  4. Mutagens which are effective on replicating DNA only are :-

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  5. Which of the following agents cause mutation through deamination :-

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  6. Haploids are preferred over diploids for mutation studies because in h...

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  7. Substitution of a purine base with a pyrimidine base or vice versa is ...

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  8. Mutations induced by 5-Bromo uracil are :-

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  9. The minimum requirement for mutation is :-

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  10. Which of the mutagen causes frame shift mutation

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  11. Mutations are :-

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  12. If a mutation is not visible in successive generation it is called :

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  13. Which of the following is most acidic?

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  14. Deamination of adenine and guanine by HNO(2) produces :-

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  15. Sickle cell anaemia is an example of :-

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  16. The most striking example of point mutation is found in a disease call...

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  17. Hexaploid or modern wheat developed through

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  18. Point mutation induced by :

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  19. If a diploid cell is treated with colchicine then it becomes

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  20. A nutritionally wild type organism, which does not require any additio...

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