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प्रश्न
Explain the formation of a nucleosome.
उत्तर
Komberg proposed a model for the nucleosome, in which 2 molecules of the four histone proteins H2A, H2B, H3, and H4 are organized to form a unit of eight molecules called histone octamere.
The negatively charged DNA is wrapped around the positively charged histone octamere to form a structure called a nucleosome. A typical nucleosome contains 200 bp of DNA helix. The histone octameres are in close contact and DNA is coiled on the outside of the nucleosome.
Nucleosome
संबंधित प्रश्न
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
Name the transcriptionally active region of chromatin in a nucleus.
Attempt any TWO of the following:
With the help of a suitable example illustrate ‘Palindrome’.
Find the odd one out:
AUG codon gives ________ & ________ amino acids in prokaryotes & Eukaryotes respectively.
Differentiate between Heterochromatin & Euchromatin.
Write a note on the packaging of DNA in prokaryotes.
Repeating units of chromatin are known as ____________.
Find out the wrong statement about heterochromatin.
Which of the following is correct about mature RNA in eukaryotes?
Read the following and answer from given below:
In prokaryotes, DNA is circular and present in the cytoplasm but in eukaryotes, DNA is linear and mainly confined to the nucleus. DNA or deoxyribonucleic acid is a long polymer of nucleotides. In 1953, the first correct double-helical structure of DNA was worked out by Watson and Crick. Based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin. It is composed of three components, i.e., A phosphate group, a deoxyribose sugar, and a nitrogenous base. Different forms of DNA are B-DNA, Z-DNA, A-DNA, C-DNA, and D-DNA.
The double helix structure of DNA was proposed by ______
Electron Transport System (ETS) is present in a eukaryotic cell in the:
Whittaker placed prokaryotes in:
Plasmid has been used as vector because ______.
In the eukaryotic cell cycle, cell fusion experiments show that:
Watson and Crick proposed the 'Double Helix' structure of DNA based on data produced by ______
______ are the amino acids of histones.
The most abundant prokaryotes helpful to human in making curd from milk and in the production of antibiotics are the ones categorised as ______ .
Part of chromatins which is densely packed stain darkly and is transcriptionally inactive is called ______.
