試題詳解

11. Which is     true     for transcription in eukaryotes?
(A) TFIIIA is a general transcription factor for RNA polymerase III, and contains a homeodomain DNA-binding motif.
(B) In the absence of the hormone ligands, type II nuclear receptors (e.g. glucocorticoid receptor) reside in the cytoplasm, bound to another protein.
(C) Insulators are DNA elements that can shield gene activation by enhancers or repression by silencers.
(D) Enhancers are position- and orientation-dependent DNA elements that stimulate transcription.
(E) Class II promoters for highly expressed genes tend to lack TATA box, whereas promoters for housekeeping tend to have TATA boxes.