The RNA polymerase holoenzyme transcribes

Options

A. the promoter, structural gene and the terminator region
B. the promoter, and the structural gene
C. the structural gene and the terminator regions
D. the structural gene only

Answer

c

Explanation

The transcriptional termination sequences generally share to common features: (i) A palindromic sequence nch in GC base pairs. (ii) A region with con- secutive A's on the template strand. Both these regions are transcribed before the release of newly formed RNA chain_. The transcript of palindromic sequence forms a hairpin and transcript of oligo-A on DNA has an oligo-U on RNA [Voet & Voet]. Both these regions help in termina- tion. Details of exact mechanism are beyond the scope of our syllabus