Choose the statements that best describe how riboswitches regulate gene expressi
ID: 207201 • Letter: C
Question
Choose the statements that best describe how riboswitches regulate gene expression. They bind to complimentary mRNA strands to prevent translation. They act as recruitment sites for ribosomes when not bound by a repressor They form a secondary structure in mRNA that changes conformation when bound by regulatory proteins. They act as ribozymes, inducing self-cleavage of the mRNA. They act as corepressors, binding repressor proteins to prevent transcription. Incorrect. Riboswitches are secondary structures of mRNA that, with the addition of regulatory proteins, can prevent or allow translation of its own mRNA strand. They do not regulate other genes or other strands of mRNAExplanation / Answer
Riboswitches form a secondary structure in mRNCA that changes conformation when bound by a regulatory proteins.
Because it is a rgulatory segment of messenger RNA molecule taht binds a small molecule resulting in a change in production of proteins encoded by mRNA. So mRNA That contains a riboswitch is directly involved in regulating its own activity.
They act as ribozymes inducing self-cleavage of the mRNA.
Because ribozyme cleaves itself in presence of sufficient concentrations of the metabolite.