InterviewSolution
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InterviewSolution
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Question : Howarethe followingformedandinvolvedin DNApackaging in a nucleus of a cell? (i)Histoneoctomer (ii)Nucleosome (iii)chromatin |
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Answer» SOLUTION :(i)Histone octamer :Histonesare positively chargedbasicproteins Histonesare rich in basicamino acids lysineandorginineboth ofwhich carry positive charge in their side chains , the Histoneproteinsare arranged to FORM a UNIT of eightmoleculescalledthehistoneoctamer. (ii)Nucleosome : the negatively chargedDNAmoleculeis wrapped around a positively charged histone octamer to form a nuclesomeA usual nuclesome contains 200 bp of DNAholix. (iii) chromatin : Nucleosome consitutes therepeating unit FOUND in the necledelous calledchromatin , chromation APPERS as thread- likestainedbodiesbodiesandnucleosomes in chromatin appea asa bead -on- string structurewhen viewed under the electroin microsccopre. |
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