Question

Which of the following features is/are correct for heterochromatin of eukaryotic nucleus?
A. It is highly expanded in interphase
B. It stains densely with basic dyes
C. It is highly condensed in interphase
D. Both B and C

Answer 1

Hint: Heterochromatin is a tightly packed form of DNA or condensed DNA, which comes in multiple varieties. These types lie on a continuum among the 2 extremes of constitutive heterochromatin and facultative heterochromatin. Both play a position withinside the expression of genes.

Complete Answer:
There are two types of chromatin of eukaryotic nucleus, namely euchromatin and heterochromatin.
A) Heterochromatin of eukaryotic nucleus stains densely with simpler dyes than euchromatin. Heterochromatin has tightly packed DNA. Heterochromatin is observed both on the outer edge of the nucleus or buried withinside the indoors of a chromosomal domain. Hence, it is highly condensed in interphase.
B) Whereas euchromatin has loosely packed DNA. Hence, it is highly expanded in interphase.

Thus, the correct answer is option D.

Additional points:
Heterochromatin has been related to numerous functions, from gene law to the safety of chromosome integrity; a number of those roles can be Attributed to the dense packing of DNA, which makes it much less handy to protein elements that normally bind DNA or its related elements.

Note: At centromeres, heterochromatin formation is directed by RNA interference (RNAi) naturally occurring process in the nucleus of eukaryotic cells that silences gene expression. RNAi all through heterochromatin formation is an essential step withinside the meeting of chromosome segregation equipment at mitosis. There are kinds of heterochromatin, constitutive HC and facultative HC, which vary slightly, relying on the DNA that they contain.