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What defines a monosaccharide?

  1. Complex carbohydrates with multiple sugar molecules

  2. Simple carbohydrates containing one sugar molecule

  3. Fats that provide energy

  4. Proteins made of amino acids

The correct answer is: Simple carbohydrates containing one sugar molecule

The definition of a monosaccharide is a simple carbohydrate that contains only one sugar molecule. Monosaccharides are the most basic form of carbohydrates and serve as the building blocks for more complex carbohydrates such as disaccharides and polysaccharides. Common examples of monosaccharides include glucose, fructose, and galactose. These single sugar units are fundamental for energy production and metabolism within the body. Other options do not align with the definition of a monosaccharide. Complex carbohydrates involve multiple sugar molecules and are characterized by their larger structures. Fats and proteins are entirely different macromolecules classified as lipids and amino acids, respectively, and serve various functions unrelated to carbohydrates. Therefore, the correct choice accurately captures the essence of what a monosaccharide is.