Which term best describes densely packed chromatin with low transcription?

Which term best describes densely packed chromatin with low transcription?

• A. Euchromatin
• B. Heterochromatin
• C. Nucleosome
• D. DNA

Answer: (B)

Dense chromatin packing reduces access of transcription machinery to the DNA, leading to little or no transcription. This tightly packed form is heterochromatin, which is commonly found in regions with few active genes and is associated with gene silencing and repressive chemical marks. In contrast, euchromatin is more open and typically transcriptionally active. A nucleosome is the basic unit of DNA wrapped around histones, not the overall transcriptional state, and DNA is the molecule itself, not describing its packaging. So, the term that best describes densely packed chromatin with low transcription is heterochromatin.

Dense chromatin packing reduces access of transcription machinery to the DNA, leading to little or no transcription. This tightly packed form is heterochromatin, which is commonly found in regions with few active genes and is associated with gene silencing and repressive chemical marks. In contrast, euchromatin is more open and typically transcriptionally active. A nucleosome is the basic unit of DNA wrapped around histones, not the overall transcriptional state, and DNA is the molecule itself, not describing its packaging. So, the term that best describes densely packed chromatin with low transcription is heterochromatin.