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Cell Division: Introduction

do chromosome...

Question

do chromosome also contain histone proteins or it is present in chromatin only ?

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Solution

Dear Parth, chromatin with histone protein forms the chromosome.

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Q. Assertion :Histones are basic proteins of major importance in packaging of eukaryotic DNA. DNA and histone comprise chromatin forming bulk of eukaryotic chromosome. Reason: Histones are of five major types

H 1

H 2 A

H 2 B

H 3

H 4

.

Q. In which of the following group of organisms chromosomes do not have histone proteins but nuclear membrane and nucleolus remain present even during cell division?

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

The chromatin material is formed of:
(a) DNA only

(b) DNA and Histones

(c) Histones only

(d) Nucleotides

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