After entering intestinal epithelial cells and dissociating from the A2 polypeptide, the A1 peptide of cholera toxin catalyzes the ADP-ribosylation of the , inhibiting its activity. This leads to higher levels of ,which binds to and activates PKA. Phosphorylation of the CFTR Cl- channel by PKA leads to the unfortunate symptoms of cholera.

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis

Based on the number of offspring they produce at one time organisms are classified into two categories many offspring at once and a few at a time sort the carry sticks based on the category they describe

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.