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InterviewSolution
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How are the following formed and involved in DNA packaging in a nucleus of a cell? (i) Histone octomer (ii) Nucleosome (iii) chromatin |
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Answer» (i) Histone octamer : Histones are positively charged basic proteins Histones are rich in basic amino acids lysine and orginine both of which carry positive charge in their side chains , the Histone proteins are arranged to form a unit of eight molecules called the histone octamer. (ii) Nucleosome : the negatively charged DNA molecule is wrapped around a positively charged histone octamer to form a nuclesome A usual nuclesome contains 200 bp of DNA holix. (iii) chromatin : Nucleosome consitutes the repeating unit found in the necledelous called chromatin , chromation appers as thread- like stained bodies bodies and nucleosomes in chromatin appea as a bead -on- string structure when viewed under the electroin microsccopre. |
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