The correct answer is the internal start transfer sequence
as this will be the first signal that would be encountered in regards of the
primary sequence that will allow the N-terminus to extend up until the
cytoplasm in which this is what the CFTR protein contains.
The questions from this lot which could be tested in a scientific manner would be "what causes some people to be color-blind"
and
"what are the best shoes to wear when exercising"
Both of these questions can be tested in a scientific way through an experiment.
No question no explanation
After you wash your hands with soap and water, it should be acceptable.
I am not sure what the answer(s) for, "which is not a major function of the kidney?" is but I can guess that your answer for that question might be, regulation of blood cell size. Also, the normal ph range of urine in humans is 6! I hope this helps!