The four main types of macromolecules found in our cells are lipids, carbohydrates, proteins, and

Macromolecules are large, complex molecules essential for life. The four major classes of biological macromolecules are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates provide energy and structural support, lipids are involved in energy storage and membrane structure, proteins perform a wide range of functions including enzymes and transport, and nucleic acids store and transmit genetic information. DNA and RNA are examples of nucleic acids. The other answer choices—fatty acids, unsaturated fats, and phospholipids—are all types of lipids rather than separate macromolecule categories. The NEX Science exam often assesses whether students can distinguish between macromolecule categories and their subcomponents. Recognizing nucleic acids as one of the four major macromolecules is fundamental to understanding genetics, protein synthesis, and cell function.

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