Question

For each of the digestive functions A–E, select the most appropriate digestive enzymes from the following list of enzymes. 

1. Rennin. 

2. Endopeptidases. 

3. Sucrase. 

4. Alpha-amylase. 

5. Deoxyribonuclease. 

A. Acts on protein to produce polypeptides and amino acids. 

B. Acts on DNA to produce nucleotides. 

C. Acts on a disaccharide to produce fructose and glucose. 

D. Acts on starch to produce dextrins and maltose. 

E. Acts on milk to produce a clot.

Answer 1

A. Option 2 Endopeptidases. Secreted by the pancreas in an inactive form, the endopeptidases that include trypsin, chymotrypsin and elastase split the peptide bonds in polypeptides. 

B. Option 5 Deoxyribonuclease. RNA is split by ribonuclease. 

C. Option 3 Sucrase. Two other disaccharidases present in intestinal secretions, lactase and maltase, split lactose and maltose into galactose and glucose and glucose and glucose respectively. 

D. Option 4 Alpha-amylase. Alpha amylase is produced by the salivary glands as well as by the pancreas. 

E. Option 1 Rennin. Found in the gastric juice of infants, rennin aids in milk digestion by causing it to clot and slow its passage out of the stomach.