A mutant strain of Salmonella bacteria carries a mutation of the ...

Question

A mutant strain of Salmonella bacteria carries a mutation of the rho protein that has full activity at 37°C but is completely inactivated when the mutant strain is grown at 40°C.

Speculate about the kind of differences you would expect to see if you compared a broad spectrum of mRNAs from the mutant strain grown at 37°C and the same spectrum of mRNAs from the strain when grown at 40°C.

Accepted Answer

Hey, everyone. Let's take a look at this question. Together. A strain of E coli is a carrier of the mutant gene and USA or and utilization substance A N USA is a highly conserved protein that interacts with R N A polymerase during transcription elongation, promoting processivity and accuracy of M R N A synthesis. Which of the following will not be a consequence of this mutation is that answer choice. A reduce fitness, answer choice B change an amino acid sequence, answer choice C defect in transcription processing or answer choice D altered gene expression. Let's work this problem out together to try to figure out which of the following will not be a consequence of the mutation. So from the question, we are able to tell that the N USA gene contains a mutation. So the mutation is in the N USA gene, which means that the mutation is not in the protein itself. And the gene is what codes for the protein, which means that this mutation does not effect the DNA sequence of that gene being transcribed. And instead the mutation affects the protein product or the raw of the protein, which could include the fitness as well as inscription and gene expression. And it does not affect the amino acid sequence. Though, answer choice B change in amino acid sequence is the correct answer. Since a change in the amino acid sequence is not a consequence of the mutation in that N USA gene. Since the mutation is in the gene and not in the protein, which means that the mutation does not affect the DNA sequence and instead affects the protein product which includes reduced fitness, a defect in transcription processing and altered gene expression. So, answer choices. AC and D are all incorrect since they are consequences of that mutation. And answer choice B A change in amino acid sequence is not a consequence of the mutant gene making answer choice B the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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