comparison of low percent. of unsatured phospholipids to high percentage?

Question

how do the properties of a membrane that contains a low percentage of unsatured phosphlipids compare with those of a membrane that contains a high percentage of unsaturated phospholipids?

Answer 1

Saturated Fats are completely "saturated" with hydrogen, meaning, there are no double bonds. The fact that there are no double bonds allow it to pack very densely, and thus at room temperature, they will be solids. Compare this to unsaturated fats, which do have double bonds, and because of this, cannot pack as tightly at room temperature. These will be LIQUIDS at room temperature.

What does this mean? Saturated fats are less fluid, and unsaturated fats are more fluid. So a region of a membrane with more unsaturated fats will be more fluid, and less unsaturated fats will be more rigid.