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Double Helical Structure of DNA

Subunit of ch...

Question

Subunit of chromatin composed of a short length of DNA wrapped around a core of histone protein is called

A

Nucleosome

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B

Chromatin fibre

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C

Chromosome

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D

None of the above

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Solution

The correct option is A
Nucleosome

Double-stranded DNA loops around histones twice, forming the nucleosome, which is the building block of chromatin packaging. DNA can be further packaged by forming coils of nucleosomes, called chromatin fibres. These fibres are condensed into chromosomes.

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Similar questions

Q. Pick the incorrect statements among the following:
(i) A typical nucleosome contains 400 bp of DNA.
(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 like asparagine and valine.
(iv) The packing of chromatin at higher level requires an additional set of proteins that collectively are referred to as non-histone chromosomal proteins.

Q. The DNA is wrapped around histone octamer and it appears as beads-on-string when seen under electron microscope. These beads in chromatin fibre further

Q. What will be the number of histone molecules in a chromatin fibre having 50 nucleosomes?

Q. Assertion :DNA is associated with proteins. Reason: DNA binds around histone proteins that form a pool and the entire structure is called as a nucleosome.

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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