Question

Select correct statement about Euchromatin :

• A. Highly condensed
• B. Associated with active transcription
• C. Found outside nucleus only
• D. Does not replicate during S phase

Hint:

Remember the prefixes: \textbf{Eu-} means "true" or "good". Euchromatin is "good" for transcription because it's open and accessible. \textbf{Hetero-} means "different". Heterochromatin is different, being condensed and silent (transcriptionally inactive).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Chromatin, the complex of DNA and protein in the nucleus, exists in two main states: euchromatin and heterochromatin, which differ in their level of condensation and transcriptional activity.
Step 2: Detailed Explanation:
Let's evaluate the statements about Euchromatin:


(A) Highly condensed: Incorrect. Euchromatin is the less condensed, or decondensed, form of chromatin. Heterochromatin is highly condensed.

(B) Associated with active transcription: Correct. The open, relaxed structure of euchromatin allows transcription machinery to access the DNA, making the genes within these regions transcriptionally active.

(C) Found outside nucleus only: Incorrect. All chromatin, including euchromatin, is located inside the nucleus.

(D) Does not replicate during S phase: Incorrect. All genomic DNA is replicated during the S phase. Euchromatin typically replicates early in the S phase.

Step 3: Final Answer:
The correct statement about euchromatin is that it is associated with active transcription.