<span>alpha subunits bind to K+ channels, close them, leading to depolarization.</span>
Saturation is when the solvent can no longer dissolve its solute because the solvent has reached its maximum level of solute, unless the temperature or pressure changes.
Therefore, A is the best answer.
Answer:
one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome
Explanation: