Which of the following structures produces the greatest variety of digestive enzymes?

Step 1: Analyze the question We need the organ that secretes the widest variety of digestive enzymes, meaning the most different types, acting on carbohydrates, proteins and fats.

Step 2: Review each option

• A. Salivary glands: Secrete mainly salivary amylase (ptyalin), which digests starch. This is essentially one enzyme (plus a little lingual lipase in some animals).
• B. Pancreas: Secretes pancreatic juice containing many enzymes: • Pancreatic amylase, which digests starch to maltose • Trypsin (from trypsinogen) and chymotrypsin, which digest proteins to peptides • Carboxypeptidase, which digests peptides to amino acids • Lipase, which digests fats to fatty acids and glycerol • Nucleases, which digest nucleic acids
• C. Stomach: Secretes pepsin (from pepsinogen) and rennin in infants, plus hydrochloric acid, which is not an enzyme. Only a few enzymes.
• D. Colon: Absorbs water and salts and houses bacteria. It does not produce significant digestive enzymes.

Step 3: Conclusion The pancreas acts on all three major food classes (carbohydrates, proteins and fats), so it produces the greatest variety of digestive enzymes.

Correct answer: B. Pancreas

Exam tip: Remember the pancreas as the "all-rounder" of digestion: amylase for carbohydrates, trypsin for proteins, lipase for fats. If a question asks about the greatest variety of enzymes, think pancreas first. The small intestine's lining also produces enzymes, but it is not among the options here.