Question 10
[Maximum number: 1]
Which enzyme is used to produce clear apple juice?
A
amylase
B
lipase
C
pectinase
D
protease
IGCSE Biology Extended 21.2.3—Use of pectinase in fruit juice Topic Practice
21.2.3—Use of pectinase in fruit juice
• Describe the use of pectinase in fruit juice production
Question 17
[Maximum number: 1]
A student places two samples of crushed apple into two beakers, P and Q. The samples are of equal size. She adds of pectinase solution to beaker P and of water to beaker Q.
After five minutes, she places the samples of crushed apple into two different filter funnels, and measures the volume of juice filtering through from each sample over a period of 10 minutes.
Which graph shows her results?
A
total volume of juice filtered through
B
C
D
Question 17
[Maximum number: 1]
A student places two samples of crushed apple into two beakers, P and Q. The samples are of equal size. She adds of pectinase solution to beaker P and of water to beaker Q.
After five minutes, she places the samples of crushed apple into two different filter funnels, and measures the volume of juice filtering through from each sample over a period of 10 minutes.
Which graph shows her results?
A
total volume of juice filtered through
B
C
D
Question 6(c)
[Maximum number: 1]
Plants can be classified according to the position and shape of the structures in their flowers.
The fruit of a pear tree, Pyrus communis, is often used to make juice.
State what protein biotechnologists will use to increase the volume of juice produced from pear fruit.