Macromolecules of Life Practice Test 2025 - Free Zeringue Biology Test Questions and Study Guide

The four main types of macromolecules found in living organisms are proteins, carbohydrates, lipids, and nucleic acids. Each of these macromolecules plays a crucial role in the structure and function of cells.

Proteins are essential for numerous cellular functions, acting as enzymes to catalyze biochemical reactions, providing structural support, and facilitating communication within and between cells. They are made up of amino acids, which are linked together in various sequences to form diverse proteins with specific functions.

Carbohydrates serve as a primary energy source for cells, as well as playing important roles in cell structure and signaling. They are composed of sugar molecules and can range from simple sugars (monosaccharides) to complex forms (polysaccharides) that are crucial for energy storage and structural integrity.

Lipids, including fats and oils, are vital for storing energy and making up the cell membrane, while also serving roles in signaling and insulation. They are hydrophobic molecules, meaning they do not mix well with water, which is essential for the formation of biological membranes.

Nucleic acids, such as DNA and RNA, are responsible for the storage and transmission of genetic information. They are essential for the synthesis of proteins and the regulation of cellular activities.

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