Which of the statements is the best explanation for why eukaryotes use so many regulatory elements, such as activators, repressors, coactivators, and basal transcription factors?
A) The complexity is necessary because RNA polymerase cannot efficiently bind to the DNA by itself.
B) The complexity is a result of multiple gene duplication events.
C) The complexity allows more than one protein to be transcribed by a single RNA polymerase.
D) The complexity allows specific control over the timing and quantity of the protein produced.
E) The complexity ensures that a single mutation cannot effect the function of the protein.
