Which chromatin contains a large amount of satellite DNA?

Which chromatin contains a large amount of satellite DNA?

• A. Euchromatin
• B. Heterochromatin
• C. Nucleosome Rich Chromatin
• D. Telomeric Chromatin

Answer: (B)

Satellite DNA is made up of many tandem repeats of short DNA motifs that are highly abundant in the centromeric and pericentromeric regions of chromosomes. Those regions are packaged as constitutive heterochromatin, which is densely packed, generally transcriptionally silent, and enriched with repetitive DNA and specific chromatin marks that keep it compact. Euchromatin, by contrast, is gene-rich and more open, with far fewer repeats. Telomeric chromatin has telomere-specific repeats, not the abundant satellite DNA characterizing centromeric regions. So the chromatin containing a large amount of satellite DNA is heterochromatin.

Satellite DNA is made up of many tandem repeats of short DNA motifs that are highly abundant in the centromeric and pericentromeric regions of chromosomes. Those regions are packaged as constitutive heterochromatin, which is densely packed, generally transcriptionally silent, and enriched with repetitive DNA and specific chromatin marks that keep it compact. Euchromatin, by contrast, is gene-rich and more open, with far fewer repeats. Telomeric chromatin has telomere-specific repeats, not the abundant satellite DNA characterizing centromeric regions. So the chromatin containing a large amount of satellite DNA is heterochromatin.