What is the basic unit of carbohydrates?

• A. Glycerol
• B. Amino acid
• C. Nucleotide
• D. Monosaccharide

Answer: (D)

The basic unit of carbohydrates is a monosaccharide. Monosaccharides are the simplest form of carbohydrates and serve as the building blocks for more complex carbohydrates. They consist of single sugar molecules, such as glucose, fructose, and galactose. These simple sugars can combine in various ways to form disaccharides (like sucrose and lactose) and polysaccharides (such as starch and cellulose).

Understanding that a monosaccharide is the fundamental unit is essential because it illustrates the way carbohydrates are structured and how they function in biological systems. While glycerol is related to lipids, amino acids are the building blocks of proteins, and nucleotides are the units that make up nucleic acids like DNA and RNA, none of these choices pertain to carbohydrates. Thus, the correct identification of monosaccharides as the basic unit of carbohydrates highlights the foundational knowledge of carbohydrate chemistry in biological contexts.