Arrange the given structures involved in packaging of DNA Helix.

(A) Chromatin
(B) Chromatin fibers
(C) Nucleosome
(D) Euchromatin

Choose the correct answer from the options given below:

(C), (A), (B), (D)

The correct answer is Option (1) → (C), (A), (B), (D) 

To understand the packaging of DNA, let’s look at the hierarchical order of structures:

(C) Nucleosome

• Basic unit of DNA packaging.
• DNA wrapped around histone proteins.

(A) Chromatin

• Nucleosomes coil together to form chromatin, a less compact form.

(B) Chromatin fibers

• Further coiling of chromatin into thicker fibers (30 nm fiber), forming more condensed structures.

(D) Euchromatin

• A form of chromatin that is lightly packed and transcriptionally active. It represents a functional stage of chromatin structure.

Correct Sequence: Nucleosome → Chromatin → Chromatin fibers → Euchromatin