試題詳解

29. A mammalian mRNA encoding a cytokine is rapidly induced and then quickly degraded. Its 3' UTR contains multiple AU-rich elements (AREs). Which mechanism best explains how this architecture enables tight temporal control of protein expression?
(A) AREs block translation initiation until removed by endonucleases.
(B) ARES prevent nuclear export, delaying translation.
(C) AREs enhance ribosome pausing to reduce the elongation rate.
(D) AREs promote nonsense-mediated decay via premature stop codons.
(E) AREs recruit RNA-binding proteins that couple deadenylation to decapping.