What do leucine zippers do during transcription regulation? a) Form hydrogen bonds in the major groove of helices b) Bind to one area of the DNA sequence c) Start the formation complex d) All of the above e) None of the above Cells preserve their identity after cell division with which of the following? a) DNA methylation b) Remembered positive feedback loops c) Maintenance of chromatin structure d) All of the above You are preparing to make a genomic DNA library from yeast. Which of the following enzymes do you need? a) DNase b) DNA Polymerase c) RNA Polymerase d) Restriction endonuclease e) Reverse transcriptase