Question

Transcription of rRNA genes captured in a Transmission Electron Micrograph Figure 7-8 Essential Cell Biology, 4th ed.(O Garland Science 2014) Which direction is transcription proceeding? Left to right, or right to left? Why are the RNA transcripts shorter than the DNA segments that encode them? 1. 2.

Answer 1

Ans.1.The transcription is proceeding in left to right direction.

Nas 2-This us because the DNA contains exons and introns .Only introns function as coding sequence.Thus RNA are copied from only a limited region of DNA and their size is shorter than the DNA segment from which they copied.