A "riboswitch" is an mRNA that alters production of protein by binding a small molecule.A riboswitch is most likely involved in regulation at the _______ level.

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A riboswitch is an mRNA that is capable of regulating gene expression upon binding to a specific small molecule ligand. Specifically, when the ligand binds to the riboswitch in the mRNA, it can cause a conformational change that affects the ability of the mRNA to be translated into protein. Therefore, the riboswitch functions at the level of translation regulation, making choice D the best option.

A "Riboswitch" Is an MRNA That Alters Production of Protein