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प्रश्न
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
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उत्तर
(i) Histone octamer: It is a unit consisting of eight molecules of histone proteins (two molecules each of H2A, H2B, H3 and H4 histones). It interacts with the DNA to keep it associated with itself.
(ii) Nucleosome: DNA (negatively charged) winds around the histone octamer (positively charged) to form a nucleosome, which acts as a building block for packaging the DNA into chromatin.
(iii) Chromatin: It is a complex of DNA and proteins. Its main function is to efficiently package the DNA into the nucleus.
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संबंधित प्रश्न
Very Short Answer Question:
Which are the nucleosomal 'core' histones?
AUG codon gives ________ & ________ amino acids in prokaryotes & Eukaryotes respectively.
Differentiate between Heterochromatin & Euchromatin.
Repeating units of chromatin are known as ____________.
The length of DNA can be calculated by ______.
Histone proteins are ______.
The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called ______.
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:
Histones are rich in ______.
