10. C An E. coli strain possesses the following genotype F ( I x ) / I + P + O + Z + Y + where l x eliminates the ability of the repressor to bind the operator. The structural genes Z Y : A) will not be transcribed under any conditions B) will be transcribed both in the presence and absence of lactose C) will be transcribed only if lactose is present D) will be transcribed only if lactose is absent E) will be transcribed but not translated.