College-level Genetics: Transcription regulation 1. Transcriptional regulation i
ID: 48429 • Letter: C
Question
College-level Genetics: Transcription regulation
1. Transcriptional regulation in eukaryotes is controlled by both cis- and trans-acting s The following strctue elements. The following structure was isolated from honey bees. It shows such elements as well as parts of a gene body indicated with relative positions. The arrow denotes the transcription start site (the drawing is not in scale). 5' 3 3' Figure 1 A) Indicate what the elements or segments, number 1, 2, 3 and 4, are most likely to 5 30 stand for B) Which numbered segments can interact with trans-acting factors? C) Which numbered segments are cis-acting elements?Explanation / Answer
A)
1 stands for a coding sequence or exon.
2 stands for RNA polymerase.
3 stands for the promoter.
4 stands for an inducer.
B)
The segments 3 and 4 interact with trans- acting elements because these segments are located upstream and are indicated with '-' sign.
C)
The segment 1 is a cis - acting element and contains +1 sign.