Which of the following statements is true regarding heterochromatin?
A) It stains lightly when stained with Feulgen reagent.
B) It represents transcriptionally active regions of the chromosome.
C) Specialized chromatin structures (scs) can insulate genes from the effects of heterochromatin.
D) Euchromatic genes that are artificially placed next to heterochromatin are transcribed at abnormally high levels.
E) Heterochromatin is hypersensitive to DNAse digestion.

Question

Quizplus · Accepted Answer

Specialized chromatin structures (scs) can act as insulators to protect genes from the repressive effects of nearby heterochromatin. Heterochromatin is tightly packed and transcriptionally inactive, so it would not represent transcriptionally active regions of the chromosome (choice B). Heterochromatin stains darkly when stained with Feulgen reagent, not lightly (choice A). Euchromatic genes that are artificially placed next to heterochromatin are transcribed at abnormally low levels, not high levels (choice D). Heterochromatin is resistant to DNAse digestion, not hypersensitive (choice E).

Which of the Following Statements Is True Regarding Heterochromatin