Question

Wild-type E. coli grow best at 37 but can grow efficiently up to 42 . An E. coli strain has a mutation of the sigma subunit that results in an RNA polymerase holoenzyme that is stable and transcribes at wild-type levels at 37 . The mutant holoenzyme is progressively destabilized as the temperature is raised, and it completely denatures and ceases to carry out transcription at 42 . Relative to wild-type growth, characterize the ability of the mutant strain to carry out transcription at: 37 degrees A. organism does not transcribe gene, B. organism transcribes slowly,C. organism transcribes a wild type, D. organism transcribes faster than a wild type What term best characterizes the type of mutation exhibited by the mutant bacterial strain?

Answer 1

Answer:Temperature- Sensitive Mutation, C

Explanation:

AT 37°C , The organism transcribe a wild type--C.

The type of mutation  exhibited by the mutant bacterial strain is a Temperature- Sensitive Mutation. This is because at different temperatures, the organism transcribes differently ie  transcribes at wild-type levels at 37°C and completely denatures and ceases to carry out transcription at 42°C .