Which of the following is true about digestive enzymes?

• A. They are lipids that emulsify fats in the stomach.
• B. They are carbohydrates that break down proteins into amino acids.
• C. They are nucleic acids that digest vitamins and minerals.
• D. They are proteins that catalyze chemical reactions in the digestive tract.

Answer: (D)

Verified step by step guidance

1. Understand the role of digestive enzymes: Digestive enzymes are crucial for breaking down food into smaller, absorbable components. They facilitate chemical reactions in the digestive tract.
2. Identify the nature of digestive enzymes: Digestive enzymes are proteins. Proteins are composed of amino acids and have specific functions, including catalyzing reactions.
3. Clarify the function of digestive enzymes: These enzymes speed up the chemical reactions necessary for digestion, such as breaking down carbohydrates, proteins, and fats into their simpler forms.
4. Differentiate digestive enzymes from other biomolecules: Unlike lipids, carbohydrates, or nucleic acids, proteins serve as enzymes due to their ability to lower activation energy and increase reaction rates.
5. Recognize the correct statement: The statement 'They are proteins that catalyze chemical reactions in the digestive tract' accurately describes the nature and function of digestive enzymes.