Where are we going with this? The information on this page should increase understanding related to this standard: Evaluate comparative models of various cell types with a focus on organic molecules that make up cellular structures.
Remember all that about carbohydrates being a source of energy in living things? And… if more carbohydrates are consumed than is needed, the excess energy gets stored as fat? Remember that?
Lipids function to store energy, provide insulation, and are important components of the cell membrane.
H hydrogenO oxygenC carbonAlso, in the special case of cell membranes, P phosphorus
- Cell Membranes
- Some hormones
The lipid molecule is NOT polar. So, "Lipids are non-polar molecules, which means their ends are not charged. Because they are non-polar and water is polar, lipids are not soluble in water. That means the lipid molecules and water molecules do not bond or share electrons in any way" (source, 2021-08-29).
Okay, hang on! Let's go this way… Water is a polar molecule meaning that one "end" has a positive charge and the other a negative charge. So, opposite charges attract. Like when hair sticks to a comb or a yarn cap because of static. In essentially the same way, the positive end of one water molecule sticks to the negative end of another water molecule. In time, all of the water sticks to other water. NOT to the non-polar lips. Since water sticks to water, all of the oil ends up isolated.
|Sources of Saturated Fats|
|Sources of Unsaturated Fats|
hydrophilic: having a tendency to mix with, dissolve in, or be wetted by water.hydrophobic: tending to repel or fail to mix with water.