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Chromatin

Subunit of ch...

Question

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

A

Nucleosome

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B

Chromatin fiber

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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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Q. Subunit of chromatin composed of a short length of DNA wrapped around a core of histone proteins is called

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. 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. 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. Histone proteins help in wrapping up the DNA.

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