Which of the following is NOT one of the four main types of macromolecules?

• A. Proteins
• B. Carbohydrates
• C. Nucleic acids
• D. Enzymes

Answer: (D)

The correct answer is that enzymes are not categorized as one of the four main types of macromolecules. Instead, enzymes fall under the broader category of proteins.

Macromolecules are large complex molecules essential for various biological functions and can be classified into four main types: proteins, carbohydrates, lipids, and nucleic acids. Proteins are made up of amino acids and play crucial roles in catalyzing biochemical reactions, structural support, and regulation within cells. Carbohydrates serve as energy sources and structural materials, while nucleic acids, like DNA and RNA, are responsible for the storage and transmission of genetic information.

Enzymes, therefore, are a specialized type of protein that facilitate biochemical reactions, but they are not a distinct category of macromolecule on their own. This distinction clarifies their role within the domain of proteins rather than representing a separate type of macromolecule.