It contains a full charge. So we see that the two things we should consider when determining whether a given molecule can make it across the phospholipid bilayer is the size of it and the polarity. And we have to weigh the two things together. So even though cholesterol is so big, because it has no charge and essentially not polar at all, it will not have any problem moving across that cell membrane. Now, let's discuss a special type of cell transport known as passive diffusion. This is basically what we just discussed.