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BIO NMDCAT Chromosomes
nmdcat.online July 4, 2026

45. An analysis of chromatin structure reveals that transcriptionally active regions exhibit an open, loosely packed conformation designated as

A. Heterochromatin
B. Euchromatin
✓
C. Solenoid arrays
D. Centromeric cores

📝 Explanation

Euchromatin is the transcriptionally active, loosely organized chromatin form that allows RNA polymerase complexes to access structural gene sequences. Heterochromatin represents tightly packed, silent regions.

📖 Additional Information

  • Heterochromatin
  • Euchromatin
  • Solenoid arrays
  • Centromeric cores

Euchromatin is the transcriptionally active, loosely organized chromatin form that allows RNA polymerase complexes to access structural gene sequences. Heterochromatin represents tightly packed, silent regions.

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44. Regarding chromatin classification, heterochromatin is functionally distinguished from euchromatin by its property of being

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