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Sort the DNA ...

Question

Sort the DNA structures in the increasing order of the complexity.

A

Chromatin

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B

DNA

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C

Chromosome

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D

Nucleosome

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Solution

The correct option is
Chromosomal DNA is packaged inside microscopic nuclei with the help of histones.
DNA wraps around the histone proteins to form nucleosomes; these in turn couple to become the chromatin fiber. The chromatin undergoes further condensation to form the chromosome.

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Q. Spirally-coiled double strands are observed in
(a) DNA
(b) chromosome
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Q. Go through the following statements
(i) A typical nucleosome contains 400 bp of DNA helix.
(ii) The positively charged DNA is wrapped around the negatively charged histone octamer to form a structure called nucleosome.
(iii) Histones are rich in the basic amino acid residues asparagine and valine
(iv) The packing of chromatin at higher level requires additional set of proteins that collectively are referred to as Non-histone chromosomal proteins.

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Q. How are the following formed and involved in DNA packaging in a nucleus of a cell?
(i) Histone octomer (ii) Nucleosome (iii) Chromatin.

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Standard XII Biology