Question

What is the significance of chromatin packaging?
A. To accommodate long chromosomes fibre and decrease the length of its DNA for accommodation in the nucleus.
B. To stabilize the gene
C. To make DNA replication easy
D. To make the process of transcription easy

Answer 1

Hint:- : Histones are positively charged and therefore adhere to negatively charged DNA and form a nucleosome which is the building block of the chromatin packaging.

Complete step-by-step solution:-
First of all, you should know about chromatin packaging. The chromosomal DNA is packed inside microscopic nuclei with the assistance of histones. These histones are positively charged proteins and these stick very fast to the negatively charged DNA and due to the binding of histones with negatively charged DNA, there is formation of complexes which is known as nucleosomes. This nucleosome is the building block of chromatin packaging.
These nucleosomes are coiled to form chromatin fibre and these chromatin fibres are again folded to produce a fibre which is tightly coiled into the chromatid of a chromosome. This whole event allows long chromosome fibres to accommodate and the length of its DNA decreases for accommodation as the microscopic nucleus accommodates a DNA as long as 2 meters having around 3 billion base pairs.
Let's look at options now, Option A is To accommodate long chromosomes fibre and decrease the length of its DNA for accommodation in the nucleus. This is the correct option since this whole event allows the microscopic nucleus to accommodate a DNA as long as 2 meters having around 3 billion base pairs. Therefore, the correct option is A.
Moving to option B which is To stabilize the gene. It is an incorrect answer as chromatin packaging does not lead in stabilizing the DNA. Therefore, this option is incorrect and it gets eliminated.
Moving to option C which is To make DNA replication easy. It is an incorrect answer as chromatin packaging does not happen to make DNA replication easy. Therefore, this option is incorrect and it gets eliminated.
Moving to option D which is To make the process of transcription easy. It is an incorrect answer as chromatin packaging does not happen to make DNA replication easy. Therefore, this option is incorrect and it gets eliminated.

Thus, the correct answer is option A i.e., To accommodate long chromosomes fibre and decrease the length of its DNA for accommodation in the nucleus.

Note:- This chromatin packaging finally leads to the formation of chromosome by coiling of nucleosomes to form chromatin fibres and these fibres form chromatid of chromosome by folding and this whole packing to accommodate long chromosomes fibre and decrease the length of its DNA for accommodation in nucleus. Therefore, the correct option is A.