Indicate true (T) and false (F) statements below regarding riboswitches. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTF.
( ) A riboswitch permits transcription elongation only when bound to its small-molecule ligand.
( ) Riboswitches appear to be a modern evolutionary invention.
( ) Riboswitches are often located near the 3? end of mRNAs, and therefore fold after the rest of the mRNA.
( ) Riboswitches are exclusively found in prokaryotes.