35. Riboswitches are regulatory elements built into mRNA. Which of the followingdescriptions about the riboswitch is not correct?
(A) One common form of riboregulation in bacteria is the use of ribonucleic acidsequences encoded within mRNA that directly affect the expression of genes encodedin the full transcript.
(B) Riboswitches are trans-acting elements.
(C) Riboswitches are defined as mRNA elements that bind ligands and regulatemRNA expression by forming alternative structures in response to this ligand binding.
(D) Riboswitches are most often located in the 5' UTR of bacterial mRNA. Therethey regulate the occlusion of signals for transcription attenuation or translationinitiation.
(E) However, in some eukaryotic mRNA, the thiamine pyrophosphate (TPP)riboswitch regulates splicing at the 3' end.