1. The enzyme that unwinds the DNA double helix is called
   1. DNAgyrase               c. helicase
   2. primase                      d. ligase
2. RNA polymerase has
   1. 5’- 3’ exonucleases
   2. 3’- 5’ exonucleases
   3. both exonucleases
   4. no exonucleases

_{                                                             ÂÂ} 

1. In the synthesis of RNA the addition proceeds by   
   1. attack of the 3’OH to the a phosphate of the incoming NTP
   2. attack of the 3’OH to the a phosphate of the incoming dNTP
   3. attack of the 5’OH to the a phosphate of the incoming NTP
   4. attack of the 5’OH to the a phosphate of the incomingdNTP                     

           

1.    The RNA transcript is identical to the
   1. nontemplate strand of DNA
   2. coding strand of DNA but T is replaced by U
   3. coding strand of DNA but U is replaced by T
   4. template strand

1.   The specific binding sites for RNA polymerase onDNA are called
   1. core subunits             
   2. transcripts
   3. introns
   4. promoters