Multiple Choice
What is the primary difference between euchromatin and heterochromatin in eukaryotic cells?
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16. Regulation of Expression
Eukaryotic Chromatin Modifications
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Which of the following represents a key functional role of heterochromatin in eukaryotic cells?
A
Enhancing transcription
B
Gene silencing
C
Promoting DNA replication
D
Facilitating RNA splicing
Verified step by step guidance1
Understand the structure of chromatin: Chromatin is a complex of DNA and proteins found in eukaryotic cells. It exists in two forms: euchromatin, which is less condensed and transcriptionally active, and heterochromatin, which is more condensed and transcriptionally inactive.
Identify the characteristics of heterochromatin: Heterochromatin is tightly packed, making it less accessible to the transcription machinery. This structural feature is crucial for its role in gene regulation.
Explore the role of heterochromatin in gene expression: Due to its condensed nature, heterochromatin is associated with gene silencing. It prevents the transcription of certain genes by making them inaccessible to RNA polymerase and other transcription factors.
Consider the options provided: Enhancing transcription, Gene silencing, Promoting DNA replication, and Facilitating RNA splicing. Evaluate which of these functions aligns with the characteristics of heterochromatin.
Conclude that the key functional role of heterochromatin is gene silencing, as its condensed structure is primarily involved in repressing gene expression by limiting access to the DNA.
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