Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

Read the given passage and answer the questions that follow :-
In prokaryotes such as E. coli ,though they do not have a defined nucleus the DNA is not scattered throughout the cell. The DNA is held with some proteins in a specific region. in eukaryotes this organisation is much more complex .There is a set of positively charged basic proteins called histones. Histones are organised to form a unit of 8 molecules called histone octamer. The negatively charged DNA is wrapped around the positively charged histone octamer.

Which of the following is transcriptionally active chromatin?

Options:

Heterochromtain

Euchromatin

Both 1 and 2

Non of these

Correct Answer:

Euchromatin

Explanation:

The correct option is 2 . Euchromatin.

In a typical nucleus, some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. The chromatin that is more densely packed and stains dark are called as Heterochromatin. Euchromatin is said to be transcriptionally active chromatin, whereas heterochromatin is inactive.