Which of the following is not true for operon concept of jacobe and monade

Options

A. structural genes, operator genes and promoter genes together constitute and operon
B. All structural genes of one operon must be present in contiguity
C. the function of promoter gene is to produce a promoter factor for transcription
D. Operator gene is present upstream to structural gene, i.e., towards 3' end of template stand

Answer

C