An enzyme is which type of macromolecule?

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

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definition of an enzyme. Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed in the process.
2. Step 2: Recall the four major types of macromolecules in biochemistry: carbohydrates, proteins, nucleic acids, and lipids. Each has distinct functions and structures.
3. Step 3: Identify the macromolecule type associated with enzymes. Enzymes are composed of amino acids, which are the building blocks of proteins. Proteins are folded into specific three-dimensional structures that allow them to function as enzymes.
4. Step 4: Eliminate the incorrect options. Carbohydrates, nucleic acids, and lipids do not function as enzymes. Carbohydrates are primarily energy sources, nucleic acids store genetic information, and lipids are involved in energy storage and membrane structure.
5. Step 5: Conclude that enzymes are proteins based on their structure and function. Proteins are the only macromolecule type capable of forming enzymes due to their ability to fold into complex shapes and interact with substrates.