What is the major difference between the mechanism involved in attenuation and riboswitches and the mechanism involved in the regulation of the lactose operon?
A. For both attenuation and riboswitches, the regulation is mediated by the DNA secondary structure, whereas the regulation of the lac operon is mediated by a repressor protein.
B. For both attenuation and riboswitches, the regulation is mediated by the RNA secondary structure, whereas the regulation of the lac operon is mediated by a repressor protein.
C. For attenuation and riboswitches, the regulation is mediated by the DNA primary structure and the RNA secondary structure, correspondingly, whereas the regulation of the lac operon is mediated by a repressor protein.
D. For attenuation and riboswitches, the regulation is mediated by the DNA primary structure and the DNA secondary structure, correspondingly, whereas the regulation of the lac operon is mediated by a repressor protein.