Nucleosome isSatellite DNADouble helical DNA- Intron interrupted DNA- Negatively charged DNA wrapped around positively charged histone octamer-

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Standard XII

Biology

Nucleosome

Nucleosome is...

Question

Nucleosome is

Intron interrupted DNA

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Double helical DNA

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Negatively charged DNA wrapped around positively charged histone octamer

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Satellite DNA

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Solution

The correct option is C Negatively charged DNA wrapped around positively charged histone octamer
A nucleosome is a structural unit of a eukaryotic chromosome, consisting of negatively charged DNA coiled around a core of positively charged histones.

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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. Read (i) to (v) and find the correct option.
(i) Nitrogen base is linked to pentose sugar through

N -

glycosidic linkage
(ii) Phosphate group is linked to

5^{'} - O H

of a nucleoside through phosphoester linkage
(iii) Two nucleosides are linked through

3^{'} - 5^{'} N -

glycosidic linkage
(iv) Negatively charged

D N A

is wrapped around positively charged histone octamer to form nucleosome
(v) Chromatin that is more densely packed and stains dark is called euchromatin

Q. ead (i) to (v) and find the appropriate option.

(i) Nitrogen base is linked to OH of 1’C pentose sugar through N-glycosidic linkage.
(ii) Phosphate group is linked to OH of 5’C of a nucleoside through phosphoester linkage.
(iii) Two nucleosides are linked through 3’–5’ N-glycosidic linkage.
(iv) Negatively charged DNA is wrapped around positively charged histone octamer to form nucleosome
(v) Chromatin that is more densely packed and stains dark is called euchromatin.

As DNA is negatively charged (or acidic) and histone are positively charged in their side chain(or basic).. Can we assume that nucleosome as a whole will be neutral neither acidic nor basic

Q. Read the following statements and choose the set of correct statements

(a) Euchromatin is loosely packed chromatin
(b) Heterochromatin is transcriptionally active
(c) Histone octomer is wrapped by negative charged

D N A

in nucleosome
(d) Histones are rich in lysine and arginine
(e) A typical nucleosome contains

400 b p

D N A

helix

Choose the correct answer from the options given below:

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Nucleosome is

The correct option is C Negatively charged DNA wrapped around positively charged histone octamer A nucleosome is a structural unit of a eukaryotic chromosome, consisting of negatively charged DNA coiled around a core of positively charged histones.

The correct option is C Negatively charged DNA wrapped around positively charged histone octamer
A nucleosome is a structural unit of a eukaryotic chromosome, consisting of negatively charged DNA coiled around a core of positively charged histones.