試題詳解

13. Which is true for eukaryotic transcription activators?
(A) A type II nuclear receptor exists an inactive form in cytoplasm before binding to its ligand.
(B) Yeast Gal4 is a Cys2His2 zinc-finger protein, involving in regulation of galactose metabolism.
(C) The basic region of a bHLH transcription factor is involved in protein dimerization.
(D) Type III nuclear receptors are also known as orphan receptors and bind to DNA as homodimers.
(E) In the bZIP transcription factor, the bZIP domain consists of two alpha-helix polypeptides, each with leucine residues separated by 5 amino acids.