A) They are called reporter genes.
B) The enzymatic activity of b-galactosidase can be easily assayed.
C) GFP is visualized by fluorescence microscopy.
D) Both genes are of viral origin.
E) The gfp gene is of eukaryotic origin, whereas lacZ is a bacterial gene.

A) agents.
B) wild type.
C) prototrophs.
D) mutants.
E) vectors.

A) They expose both transcriptional and translational controls.
B) Both target and reporter genes have their own promoter sequences.
C) Both target and reporter genes have ribosome-binding sites.
D) Only the reporter gene has a promoter.
E) They produce a single transcript and a single hybrid reporter-target polypeptide.