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Refer the given figure of nucleosome and select the option that correctly identifies the parts A,B and C. A. `{:(A,B,C,),("DNA"," Histone octamer ",H_(1)"histone", ),(,,,):}`B. `{:(A,B,C,),("Histone octamer", H_(1)"histone",DNA, ),(,,,):}`C. `{:(A,B,C,),("Histone octamer",DNA, H_(1)"histone", ),(,,,):}`D. `{:(A,B,C,),(DNA, H_(1)"histone","Histone octamer" ,),(,,,):}` |
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Answer» Correct Answer - c (c) : In eukaryotes, DNA organisation is complex. There is a set of positively changed, basic porteins called histones. Histones are rich in the basic amino acid residues lysine and arginine. There are five types of histone proteins-`H_(1),H_(2)A,H_(2)B, H_(3) and H_(4)`. Four of them `(H_(2)A, H_(2)B, H_(3) and H_(4))` produce histone octamer called nu body or core of nucleosome . The negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome. DNA connecting two adjacent nucleosomes is called linker DNA which bears `H_(1)` histone proteins. |
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