What is the main difference between heterochromatin and euchromatin?

• A. Heterochromatin is associated with histone acetylation, while euchromatin is associated with DNA methylation.
• B. Heterochromatin is found only in prokaryotes, while euchromatin is found only in eukaryotes.
• C. Heterochromatin is densely packed and transcriptionally inactive, while euchromatin is loosely packed and transcriptionally active.
• D. Heterochromatin contains only non-coding DNA, whereas euchromatin contains coding DNA.

Answer: (C)