Question

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

                                                               

3. 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 incoming dNTP                     

           

4.    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

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

Answer 1

1. c, helicase

2. d, no exonuclease

3. a, attack of the 3’OH to the a phosphate of the incoming NTP

4. b, coding strand of DNA but T is replaced by U

5. d, promoters