How would mutations that inactivate each of the following genes a...

Question

How would mutations that inactivate each of the following genes affect the determination of the lytic or lysogenic life cycle in mutated λ phage strains? Explain your answers.cII

Accepted Answer

Hi, everyone. Let's take a look at this practice problem together, identify the gene whose transcription will not be affected by a mutation in the C two gene. The answer options are a excision, A's gene B integrates gene, C exo nucleate gene and D the C three gene. Now recall that the C two gene codes for the C two protein. And this protein is a key player in determining whether the lysogenic or li cycle will occur for the virus. Now, when the C two protein is present, it activates lysogen recall. This is the cycle where the virus genome is incorporated into the host cell genome and is replicated. So, a mutation in the C two gene will affect any gene involved in misogyny. Therefore, we need to identify the gene that is not involved in misogyny. So let's take a look at our answer options. Option B, the integrase gene, this codes for an enzyme called integrase and it is responsible for integrating and exercising the viral genome during lysogenic establishment. So we can eliminate, option B, it is involved in the lysogenic cycle. Then we have option C, the exonuclease gene. This codes for the enzyme exonuclease. This enzyme degrades double stranded DNA for recombination. And so that's allowing recombination to occur between the host and the virus genomes. This is also part of misogyny. So, option C is incorrect as well. Option D, the C three gene codes for the C three protein. Now, the C three protein protects C two protein from being broken down. It also plays a role in the lysogenic cycle. So option D is incorrect. It is the excision age gene that is not part of misogyny and thus will not be affected by the mutation, excision A gene codes for the in excision enzyme. And this exc exercises the viral genome for lysis during the establishment of the li cycle. That means the correct answer is option a excision A gene. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

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How would mutations that inactivate each of the following genes affect the determination of the lytic or lysogenic life cycle in mutated λ phage strains? Explain your answers.cII

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