What type of macromolecule is primarily responsible for catalyzing biochemical reactions in the body?

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

Answer: (C)

Proteins are primarily responsible for catalyzing biochemical reactions in the body due to their role as enzymes. Enzymes are a specific class of proteins that greatly accelerate the rate of chemical reactions by lowering the activation energy required for those reactions to occur. Each enzyme has a unique structure that allows it to bind to specific substrates, facilitating various biological processes essential for life, such as metabolism, DNA replication, and signal transduction.

Nucleic acids, such as DNA and RNA, are primarily involved in the storage and transmission of genetic information rather than directly catalyzing reactions. Carbohydrates serve mainly as energy sources and structural components in cells, while vitamins play important roles as coenzymes or cofactors that assist enzymes in their function, but they do not catalyze reactions themselves. Thus, the primary responsibility for catalyzing biochemical reactions lies with proteins, making them the right choice in this context.