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.

Find the out the incorrect statements,

(i), (ii), & (iii)

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(ii), (iii), & (iv)

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(ii) & (iii)

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(i), (iii), & (iv)

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Solution

The correct option is A (i), (ii), & (iii)
A typical nucleosome has 200 bp of DNA, DNA is negatively charged and histone is positive. Asparagine is amide of aspartic acid and valine is a neutral amino acid. Histones are rich in basic amino acids lysine and arginine.

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Similar questions

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. 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.

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

Q. Read the following statements and select the Correct option.
(i) Loosely packed and lightly stained region of chromatin are called as heterochrormatin.
(ii) Densely packed and dark stained region of chromatin are called as euchromatin.
(iii) A typical nucleosome contains 200 bp of DNA helix.

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The correct option is A (i), (ii), & (iii)A typical nucleosome has 200 bp of DNA, DNA is negatively charged and histone is positive. Asparagine is amide of aspartic acid and valine is a neutral amino acid. Histones are rich in basic amino acids lysine and arginine.

The correct option is A (i), (ii), & (iii)
A typical nucleosome has 200 bp of DNA, DNA is negatively charged and histone is positive. Asparagine is amide of aspartic acid and valine is a neutral amino acid. Histones are rich in basic amino acids lysine and arginine.