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Anni [7]
3 years ago
10

What determines whether or not a body system is likely to remain in a phylum over the course of evolution

Biology
1 answer:
Ronch [10]3 years ago
6 0
Bauplan is the assembly of the body structure which is common in the organisms belonging to the same phylum. The Same bauplan determines that a body part of the organisms are same and they will be in the same phylum in the Evolution also. Bauplan includes symmetry, segmentation, and limb disposition. 
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Researchers have identified a mutant form of sigma factor that binds more tightly to the core polymerase enzyme compared to a no
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The transcription rate will slow down in the cells that carry mutant sigma factor.

Explanation:

Sigma factor play an important role during initiation of transcription.The sigma factor binds to the core RNA polymerase(that contains alpha,beta,beta dash and omega subunit) to form hollow enzyme.

          The binding to sigma factor to core RNA polymerase initiates the formation closed promoter complex and the release of sigma factor result in the formation of open promoter complex that signals the ending of transcription initiation.

     Now if the sigma factor binds tightly to the core RNA polymerase then it will be difficult for the sigma factor to get dissiciated from hollow enzyme,as a result transcription will remain in the initiation phase. So the process cannot enter the elongation phase.

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Yes, that is correct
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