4. Why is most food digested? A. Digestive enzymes require a variety of substrates. B. It ensures that the diet is balanced. C. Most ingested food molecules are large. D. To prevent disorders of the intestine. (Total 1 mark) 5. Two cellular activities that support human life are absorption and assimilation. What is needed for assimilation but not for absorption? A. Enzymes to synthesize new molecules B. Blood capillaries C. Dissolved nutrients D. Microvilli (Total 1 mark) 6. Describe the role of enzymes in digestion with reference to two named examples. (Total 5 marks) 7. Draw a labelled diagram of the digestive system. (Total 5 marks) 8. State the sources, substrate, product, and optimum pH conditions for the enzyme amylase.
Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.
