Advertisements
Advertisements
प्रश्न
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write a note on the packaging of DNA in Eukaryotes.
Explain the formation of a nucleosome.
Which of the following is the CORRECT statement with respect to formation of nucleosome?
The length of DNA segment having 44 base pairs is ______
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 ______
Read the following and answer from given below:
The translation is the process of polymerization of amino acids to form a polypeptide. The order and sequence of amino acids are defined by the sequence bases in the mRNA. The amino acids are joined by a bond called a peptide bond. The ribosome is the site of protein synthesis.
During translation, how many initiation factors are required in eukaryotes for initiation reactions?
In the eukaryotic cell cycle, cell fusion experiments show that:
In an experiment, DNA is treated with a compound which tends to place itself amongst the stacks of nitrogenous base pairs. As a result of which, the distance between two consecutive base increases, from 0.34nm to 0.44 nm. Calculate the length of DNA double helix (which has 2 × 109 bp) in the presence of saturating amount of this compound.
What do the 'beads on strings' structure of DNA packaging represent?
Part of chromatins which is densely packed stain darkly and is transcriptionally inactive is called ______.
