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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
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
The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is _______________.
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.
Which of the following is the CORRECT statement with respect to formation of nucleosome?
The length of DNA can be calculated by ______.
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.
Name the linkage present between the nitrogen base and pentose sugar in DNA.
Which one of the following cell organelle is considered as ‘Cell within a cell’?
Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?
