43.Which of the following is NOT a characteristic of a riboswitch?
(A) They are structures that exist in the 5' untranslated region of some mRNA molecules.
(B) They exert gene expression control only at the level of translation.
(C) They physically bind to small-molecule metabolites.
(D) Ligand-binding to the riboswitch can sequester the Shine-Delgarno sequence.
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