Which of the following mechanisms of gene regulation is epigenetic? A. Tissue-sp

Question

Which of the following mechanisms of gene regulation is epigenetic?

A. Tissue-specific patterns of nucleosome acetylation are established near a gene promoter early in development, and are perpetuated through subsequent rounds of cell division.

B. Different transcription factors bind to heart-specific and lung-specific enhancer regions to activate gene transcription in these tissues.

C. A transcriptional regulatory protein is produced only when phenylalanine levels are low, and binds to enhancer regions of genes involved in phenylalanine biosynthesis to activate their transcription.

D. A hormone binds to a transcription factor, making it able to bind DNA and activate transcription when sucrose is present.

Explanation / Answer

C. A transcriptional regulatory protein is produced only when phenylalanine levels are low, and binds to enhancer regions of genes involved in phenylalanine biosynthesis to activate their transcription.

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