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Significance of Protein

Give reason: ...

Question

Give reason: Histones are positively charged

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Solution

Histones are a family of basic proteins that associate with DNA in the nucleus and help condense it into chromatin, they are alkaline (basic pH) proteins, and their positive charges allow them to associate with DNA.
Histones have many arginine and lysine amino acids which are positively charged. Hence Histones are positively charged proteins that facilitate the packing of DNA into condensed chromatin fibers.

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Similar questions

Q. How do histones acquire positive charge?

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.
Reason [R]: Histone proteins associated with DNA are positively charged.

Q. Mention what enables histones to acquire a positive charge.

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.

Find the out the incorrect statements,

Q. Diveregence increases when a positively charged body is brought near a positively charged gold leaf electroscope. Give reason.

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