Heterochromatin tends to be _____ in transcription

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Multiple Choice

Heterochromatin tends to be _____ in transcription

Explanation:
The concept being tested is how chromatin structure affects transcription. Heterochromatin is densely packed, which makes DNA less accessible to RNA polymerase and transcription factors. This tight packaging, along with repressive histone marks and DNA methylation, keeps the transcription machinery from efficiently engaging promoters. As a result, transcription levels are typically very low or effectively absent, so heterochromatin is described as inactive in transcription. While some heterochromatin can become active under certain circumstances (facultative heterochromatin), the usual state is transcriptional inactivity.

The concept being tested is how chromatin structure affects transcription. Heterochromatin is densely packed, which makes DNA less accessible to RNA polymerase and transcription factors. This tight packaging, along with repressive histone marks and DNA methylation, keeps the transcription machinery from efficiently engaging promoters. As a result, transcription levels are typically very low or effectively absent, so heterochromatin is described as inactive in transcription. While some heterochromatin can become active under certain circumstances (facultative heterochromatin), the usual state is transcriptional inactivity.

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