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NEET · Biology · STD 12 - 5. molecular basis of inheritance

હિસ્ટોન \(H_1\) નું ન્યુક્લિઓઝોમ્સ સાથેનું જોડાણ શું સૂચવે છે ?

  1. A \(DNA\) નું બેવડું કુંતલ અભિવ્યક્ત થાય છે
  2. B \(DNA\) નું ક્રોમેટીન તંતુઓમાં સંઘનન થયું છે.
  3. C \(DNA\) નું સ્વયંજનન થાય છે.
  4. D પ્રત્યાંકન થાય છે .
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Correct Answer

(B) \(DNA\) નું ક્રોમેટીન તંતુઓમાં સંઘનન થયું છે.

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(b) : Histones help in packaging of \(DNA\). In eukaryotes, \(DNA\) packaging is carried out with the help of positively charged basic proteins called histones. Histones are of five types -\(H_1, H_2A, H_2B,H_3\) and \(H_4\). \(H_1\) is attached over the linker \(DNA\). Histone contains a large proportion of the positivelycharged (basic) amino acids, lysine and arginine in their structure. \(DNA\) is negatively charged due to the phosphate groups on its backbone. The result of these opposite charges is strong attraction and therefore, high binding affinity between histones and \(DNA\).
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