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प्रश्न
Explain the role of histones in forming a nucleosome.
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उत्तर
(i) Histones are positively charged basic proteins which are organised to form a unit of eight molecules called histone octamer.
(ii) Histones are rich in the basic amino acids residues lysines and arginines which carry positive charges in their side chains.
(iii) The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome.
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संबंधित प्रश्न
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
Draw a neat and labelled diagram of the Nucleosome.
Read the following and answer from given below:
The process of copying genetic information from the template strand of DNA into RNA is called transcription. It is mediated by RNA polymerase. Transcription takes place in the nucleus of eukaryotic cells. In transcription, only a segment of DNA and only one of the strands is copied into RNA.
Monocistronic structural genes are found in which organisms?
Replication of DNA in eukaryotes is initiated by ______.
The human genome contains approximately how many base pairs per diploid cell?
How many base pairs are contained in E. coli DNA?
In the prokaryotic DNA compaction pathway, what is the diameter of relaxed circular DNA?
Which protein introduces negative supercoils in prokaryotic DNA?
How much DNA is wrapped around the histone octamer in a nucleosome?
What is the diameter of the nucleosome fibre (beads-on-string structure)?
