The trpL region contains four repeated DNA sequences tha...

Question

The trpL region contains four repeated DNA sequences that lead to the formation of stem-loop structures in mRNA. What are these stem-loop structures, and how do they affect transcription of the structural genes of the trp operon?

Accepted Answer

Hi everyone. Let's take a look at this practice problem together. What is the function of the T R P L region in the regulation of the trip toan operon? The answer options are A, it binds to the operator sequence B, it binds to the repressor protein C, it encodes a short liter peptide and R N A and option D it causes the formation of the anti terminator sequence. So recall that the L N T R P L stands for leader. So T R P L is an abbreviation for trip to fan leader region and this is a region that is located between the promoter and the rest of the opera genes. So let's talk about the answer options. Option A, this is something that will bind to an operator sequence and that is known as a repressor. This is the function of a repressor. This is not what the leader region does. So option A is incorrect. Then we have option B, something that binds to a repressor protein is known as a corepressor and this is not the function of the later region either. So we can eliminate option B as well. Now, option D, the anti terminator sequence would be something that is involved in regulating termination of transcription. Now recall that the leader region is located again between the promoter and the rest of the genes. It is not involved in termination regulation. And so we can eliminate option D as well. The correct answer is option C, the leader sequence does contain R N A. It's four repeated sequences and it contains a short leader peptide And this is important in whether transcription will continue or attenuation will occur. So the correct answer is option C, it encodes a short liter peptide and R N A. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

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The trpL region contains four repeated DNA sequences that lead to the formation of stem-loop structures in mRNA. What are these stem-loop structures, and how do they affect transcription of the structural genes of the trp operon?