Question

What is the arrangement of the promoter in relation to the transcription site?

1) Promoter is on the right side of the transcription site
2) Promoter is on the left side of the transcription site
3) Promoter is upstream of the transcription site
4) Promoter is downstream of the transcription site

Answer 1

The arrangement of the promoter in relation to the transcription site is on the left side if the DNA strand is read from left to right, and on the right side if the DNA strand is read from right to left. The promoter is also located upstream of the transcription site.

Step-by-step explanation:

The arrangement of the promoter in relation to the transcription site depends on the directionality of the DNA strand.

If the DNA strand is read from left to right, the promoter is located on the left side of the transcription site.

Alternatively, if the DNA strand is read from right to left, the promoter is located on the right side of the transcription site.

Moreover, the promoter is also described as being located upstream of the transcription site, as it lies 5' to, or before, the transcription start site.