Lipid

Definition

Lipids are a diverse group of hydrophobic molecules that play crucial roles in cell membrane structure, energy storage, and signaling. They include fats, oils, waxes, phospholipids, and steroids.

5 Must Know Facts For Your Next Test

1. Lipids form the basic structure of cell membranes through a bilayer of phospholipids.
2. Fatty acids are building blocks of many lipids and can be saturated or unsaturated.
3. Steroids, a type of lipid, function as signaling molecules and include hormones like testosterone and estrogen.
4. Triglycerides are a major form of energy storage in cells and consist of three fatty acids linked to glycerol.
5. Lipid metabolism is essential for the synthesis and breakdown of cellular lipids, influencing various physiological processes.

Review Questions

• What roles do lipids play in cell membrane structure?
• How do saturated and unsaturated fatty acids differ?
• What is the significance of triglycerides in energy storage?

Related terms

Phospholipid: A lipid containing a phosphate group in its molecule; forms the primary component of cell membranes.

Fatty Acid: A carboxylic acid with a long aliphatic chain which can be either saturated or unsaturated.

Steroid: A type of lipid characterized by a carbon skeleton with four fused rings; includes hormones like cholesterol.