Question

One strand of a DNA molecule has the following sequence: 3-AGTACAAACTATCCACCGTC-5. In order for transcription to occur in that strand, there would have to be a specific recognition sequence, called a(n) __________, to the left of the DNA sequence indicated.

a) intron
b) promoter
c) exon
d) centromere
e) AUG codon

Answer 1

The correct answer is b) promoter

Step-by-step explanation:

Promoter is a cis-acting DNA sequence that is position dependent and is present upstream to the transcription start point. This upstream sequence is very much specific and necessary to accurately initiate the transcription.

For example, E.coli promoter consists of two consensus sequence upstream to the transcription start site. So DNA polymerase recognize these sequence and binds to the promoter region. After binding, it starts the transcription of the mRNA.

Therefore promoter is the specific recognition sequence which is required to be recognized by RNA polymerase to initiate the transcription of mRNA.