5.3. Which of the following statements about repressor proteins is TRUE?
When a repressor protein is bound to its operator, it stops transcription by blocking RNA polymerase
from binding to the promoter.
When a repressor protein is bound to the promoter, RNA polymerase is more likely to initiate
transcription.
When a repressor protein is present in a cell, transcription for the genes under the control of the
repressor is stopped completely.
When a repressor protein binds to RNA polymerase, the polymerase molecule can no longer
transcribe any genes in the cell.