Which of the following is an example of heterochromatin in eukaryotic cells?

• A. Euchromatin
• B. Telomeric regions
• C. Centromeric regions
• D. Actively transcribed genes

Answer: (C)

Verified step by step guidance

1. Understand the concept of chromatin: Chromatin is a complex of DNA and protein found in eukaryotic cells. It exists in two forms: euchromatin and heterochromatin.
2. Define euchromatin: Euchromatin is a less condensed form of chromatin that is generally transcriptionally active, meaning it is accessible for gene expression.
3. Define heterochromatin: Heterochromatin is a tightly packed form of DNA, which is transcriptionally inactive. It is often found in regions of the genome that are not actively transcribed.
4. Identify examples of heterochromatin: Common examples include centromeric regions and telomeric regions. These areas are typically involved in structural functions rather than gene expression.
5. Recognize the correct answer: Centromeric regions are a classic example of heterochromatin due to their structural role in chromosome segregation during cell division and their transcriptionally inactive nature.