Which is true regarding the structure of transcription factors? Beta sheets fit

Question

Which is true regarding the structure of transcription factors?                   

                                Beta sheets fit into the major grooves of DNA

                                Alpha helices fit into the major grooves of RNA

                                Alpha helices fit into the major grooves of DNA

                                Beta sheets fit into the minor grooves of DNA

                                Beta sheets fit into the major grooves of DNA

                                Alpha helices fit into the major grooves of RNA

                                Alpha helices fit into the major grooves of DNA

                                Beta sheets fit into the minor grooves of DNA

Explanation / Answer

alpha-helices fit into the major groove of DNA is true regarding the structure of transcription factors. This is certainly true for Transcription factors having a Helix-turn-helix motif..

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