Which of the Following Mechanisms Is Used to Coordinate the Expression

Multiple Choice

Which of the following mechanisms is used to coordinate the expression of multiple,related genes in eukaryotic cells?

A) A specific combination of control elements in each gene's enhancer coordinates the simultaneous activation of the genes.
B) The genes share a single common enhancer,which allows appropriate activators to turn on their transcription at the same time.
C) The genes are organized into large operons,allowing them to be transcribed as a single unit.
D) A single repressor is able to turn off several related genes.