What role do homeobox genes play in cell differentiation?
a. They code for transcription factors that activate other genes important in cell development and differentiation
b. They attach to a cluster of proteins to form a silencing complex, which binds to and destroys certain RNA
c. They block certain gene expression
d. They cut double-stranded loops into microRNA
Answer: a. They code for transcription factors that activate other genes important in cell development and differentiation
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