Which of the following mechanisms of gene regulation is epigenetic? A. Tissue-sp
ID: 42062 • Letter: W
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.