Professor Marcus is studying gene expression in the liver cells of a mouse. She observes that when a
steroid hormone enters the liver cells, the cells begin producing a wide variety of new proteins.
Which of the following statements is the MOST USEFUL to include in an explanation of this observation?
O A. The steroid hormone contains several genes.
O
B. A transcription factor activates a single gene that produces several proteins.
OC. A transcription factor activates many genes at the same time.
о
D. The steroid hormone mimics the function of several mRNA molecules.