All cells have an outer plasma membrane ... like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do ...

Each component of a cell has its own function. Animal and plant cells differ and they have similarities. Nucleus, cell membrane ... fruits like apples. When they're well-watered, the vacuoles ...

specialized channels in the plasma membrane open and allow rapid ion movement into or out of the cell, and this movement creates an electrical signal. But what do these channels look like ...