Lipids

Definition

Lipids are a diverse group of hydrophobic molecules that include fats, oils, and steroids. They are essential for storing energy, forming cell membranes, and acting as signaling molecules.

5 Must Know Facts For Your Next Test

1. Lipids are composed mainly of carbon, hydrogen, and oxygen atoms.
2. The primary types of lipids include triglycerides, phospholipids, and sterols.
3. Triglycerides are the main form of stored energy in animals.
4. Phospholipids make up the basic structure of all cell membranes.
5. Steroids like cholesterol play a crucial role in maintaining membrane fluidity and serve as precursors to hormones.

Review Questions

• What elements primarily make up lipids?
• Which type of lipid is most important for cell membrane structure?
• What function do triglycerides serve in animals?

Related terms

Triglyceride: A type of lipid formed from three fatty acids and one glycerol molecule; used for long-term energy storage.

Phospholipid: A lipid containing a phosphate group; essential component of cell membranes.

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