3
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.
(Total 4 marks)