During Elongation, RNA Polymerase Has Three Prominent Channels, or Grooves

Multiple Choice

During elongation, RNA polymerase has three prominent channels, or grooves. These channels provide sites for all of the following, EXCEPT

A) a site for the entry of ribonucleoside triphosphates.
B) a site for the exit of the diphosphates removed from the nucleotide triphosphates.
C) a site for the growing RNA strand.
D) a site for the double- stranded DNA molecule.