Eukarya
Cell membrane; separates a cell from its environment. ... Both types are found in the same multicellular organism, but one cell type produces many proteins, and the other does not
The answer is all of these
Sodium, potassium, chloride and calcium ions are important for establishing the resting potential of the cell. The sodium-potassium gradient is maintained by a pump which transports 2 potassium inside the cell and 3 sodium ions outside the cell.