Structured questions
In an experiment on the action of the enzyme amylase, equal volumes of enzyme and starch
solution were mixed. The quantity of maltose (product) was measured during two separate
experiments, one at 18 °C, the other at 25 °C. The results are shown in the graph below.
1.
a.
b.
C.
quantity of maltose produced
(arbitrary unit)
12.
10-
8.
0 2 4
6
25 °C
18 °C
8 10 12 14 16 18
time (min)
Explain why the quantity of maltose produced eventually levelled off at both
temperatures.
[1 mark]
Explain why, at 4th minute time, more maltose had been produced at 25 °C than at 18 °C.
[4 marks]
In terms of the properties of enzyme, explain why amylase is the only enzyme that breaks
down starch.
[1 mark]