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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 2. at 40 degrees 3. At 47 degrees 4. What term best characterizes the type of mutation exhibited by the mutant bacterial strain?
What is the relationship between the BRCA1/BRCA2 mutations and breast cancer? If a woman has one of these mutations, should she opt for preventative mastectomy? Provide an assessment based on your knowledge of the situation.
What is the free energy cost of pumping Ca2+ out of a cell when the cytoplasmic concentation is 0.4Um, the extracellular concentration is 1.5mM and the membrane potential is -60mV?
What chemical property of the leucine residues thought to form tight ring that prevents the passage of ions within the channel of the acetylcoline receptor suits them for this role.
Speculate on and/or research potential mechanisms which would afford the improved processing. Speculate on and/or research potential mechanisms.
Components of the endomembrane system can become bigger as demands on their function increase. Identify which parts of endomembrane system would be bigger in
The Entner-Doudoroff pathway, which is used by some microorganisms, including the talented Sinorhizobium meliloti:
Given that axons grow out through the action of microtubules, what should happen to axons growing out from a neuron when they are exposed to colchicine?
Since the invention of the first vaccine in the 1700s, there has been controversy whenever a new vaccine is introduced. Are they safe explain your answer.
Cut wings is an X chromosome recessive mutant of D melanogaster. Antennaless is an autosomal recessive mutant. A cut, antennaless female is mated to a wild-type male.
Create and label a generalized life cycle of Fungi with special reference to ploidy. Label plasmogamy and karyogamy in the life cycle.
What interactions occur between the following molecules and Ions.
How would you interpret a negative slide test and a positive tube test using the same organism?
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