Which of the following is true about prokaryotic gene regulation?
A) A regulator gene codes for a repressor protein that controls the operon.
B) An operator is the sequence of DNA where the RNA polymerase attaches.
C) Promoters code for enzymes and are transcribed as a unit.
D) Structural genes are located outside the operon and code for enzymes.
Answer: A) A regulator gene codes for a repressor protein that controls the operon.