Lipids

Definition

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

5 Must Know Facts For Your Next Test

1. Lipids are primarily composed of carbon, hydrogen, and oxygen atoms.
2. Triglycerides, a type of lipid, consist of one glycerol molecule bound to three fatty acids.
3. Phospholipids form the bilayer of cell membranes with hydrophilic heads and hydrophobic tails.
4. Steroids, such as cholesterol, function as signaling molecules and structural components of cell membranes.
5. Unsaturated fats have at least one double bond in their fatty acid chains, while saturated fats have no double bonds.

Review Questions

• What are the primary components of triglycerides?
• How do phospholipids contribute to cellular structure?
• What is the difference between saturated and unsaturated fats?

Related terms

Carbohydrates: Biological macromolecules consisting of carbon, hydrogen, and oxygen that serve as major energy sources.

Proteins: Macromolecules made up of amino acids that perform various functions including catalysis and structural support.

Nucleic Acids: Polymers like DNA and RNA that store genetic information and enable protein synthesis.