Overview
This lecture introduces the four main types of biological macromolecules—carbohydrates, lipids, proteins, and nucleic acids—and summarizes their roles in the body.
The Four Classes of Macromolecules
- The four main macromolecules are carbohydrates, lipids, proteins, and nucleic acids.
- Macromolecules act as building blocks and energy sources for the body’s metabolic processes.
Carbohydrates
- Carbohydrates include sugars and starches.
- They serve as a primary energy source for cells.
Lipids
- Lipids include fats, waxes, oils, and cholesterol.
- They function in energy storage, cell membranes, and signaling.
Proteins
- Proteins are composed of amino acids.
- They provide structural support and facilitate metabolic reactions in the body.
Nucleic Acids
- Nucleic acids include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
- DNA stores genetic information.
- RNA copies DNA information and is involved in protein synthesis.
- Some nucleic acids, like ATP (adenosine triphosphate), store and release energy for cellular processes.
Key Terms & Definitions
- Macromolecules — Large complex molecules that are essential for life, including carbohydrates, lipids, proteins, and nucleic acids.
- Carbohydrates — Sugars and starches that provide energy and structural support.
- Lipids — Fats and related molecules involved in energy storage, insulation, and cellular functions.
- Proteins — Chains of amino acids with structural and catalytic roles.
- Nucleic acids — DNA and RNA; molecules responsible for genetic information and some energy functions.
- Amino acids — Building blocks of proteins.
- DNA (Deoxyribonucleic acid) — Stores genetic information.
- RNA (Ribonucleic acid) — Involved in protein synthesis and gene expression.
- ATP (Adenosine triphosphate) — Primary energy carrier in cells.
Action Items / Next Steps
- Begin detailed study of carbohydrates as the first macromolecule class.