Which type of macromolecule is the sugar glucose?

• A. Nucleic acid
• B. Carbohydrate
• C. Lipid
• D. Protein

Answer: (B)

Verified step by step guidance

1. Understand the question: The problem is asking to identify the type of macromolecule that glucose belongs to. Glucose is a simple sugar, so we need to determine which category of macromolecules includes sugars.
2. Recall the four major types of macromolecules: Nucleic acids, carbohydrates, lipids, and proteins. Each has distinct characteristics and functions in biological systems.
3. Focus on carbohydrates: Carbohydrates are macromolecules that include sugars, starches, and fibers. They are primarily composed of carbon (C), hydrogen (H), and oxygen (O) atoms, often in a ratio of 1:2:1. Glucose, with the molecular formula \( \text{C}_6\text{H}_{12}\text{O}_6 \), fits this description.
4. Eliminate other options: Nucleic acids (e.g., DNA and RNA) are composed of nucleotides, lipids are hydrophobic molecules like fats and oils, and proteins are made of amino acids. Glucose does not fit the structural or functional characteristics of these macromolecules.
5. Conclude: Based on its structure and classification, glucose is a carbohydrate. This is the correct answer to the question.