BIO NMDCAT Chromosomes

nmdcat.online July 4, 2026

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

A. Tightly condensed and transcriptionally inactive

✓

B. Enriched with high amounts of structural mRNA molecules

C. Completely devoid of core histone octamers

D. Replicated exclusively during early G1 cell phase

📝 Explanation

Heterochromatin remains heavily condensed throughout the cell cycle and contains dense, methylated DNA sequences that are mostly transcriptionally silent.

📖 Additional Information

Tightly condensed and transcriptionally inactive
Enriched with high amounts of structural mRNA molecules
Completely devoid of core histone octamers
Replicated exclusively during early G1 cell phase

Heterochromatin remains heavily condensed throughout the cell cycle and contains dense, methylated DNA sequences that are mostly transcriptionally silent.

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