You are looking at an electron micrograph of several transcriptional units for rRNA.How can you tell where the transcription initiation site is?
A)It is near the longest nascent transcripts.
B)It is near the middle of the Christmas tree.
C)It is near the shortest nascent transcripts.
D)It is always 40 µm from the center of the Christmas tree.
E)It is near the centromere.

Question

Quizplus · Accepted Answer

The transcription initiation site is near the shortest nascent transcripts because transcription starts at this point and the RNA chain grows longer as transcription proceeds.

You Are Looking at an Electron Micrograph of Several Transcriptional