A) a region of DNA that has been damaged by mutation.
B) E. coli cells that contain a desired, cloned piece of DNA.
C) the position of a particular gene of a chromosome.
D) the position of internally double-stranded regions in a single-stranded DNA molecule.
E) the specific binding site of a repressor, polymerase, or other protein on the DNA.

A) DNA helicase activity
B) DNA polymerase activity
C) formation of an open complex
D) protein binding to specific DNA sequences
E) protein phosphorylation

A) associates with the promoter before binding core enzyme.
B) combines with the core enzyme to confer specific binding to a promoter.
C) is inseparable from the core enzyme.
D) is required for termination of an RNA chain.
E) will catalyze synthesis of RNA from both DNA template strands in the absence of the core enzyme.