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Question 17N.3.HL.TZ0.12a

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Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.HL.TZ0.12a
Level HL Paper 3 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 3]
17N.3.HL.TZ0.12a
(a)

Beans contribute to flatulence. Alpha-galactosidase, derived from the fungus Aspergillus niger, is an enzyme that breaks down the fibre usually fermented by bacteria, reducing intestinal gas. Describe how alpha-galactosidase would be produced using A. niger in a continuous fermenter.

[3]

Markscheme

a. constant nutrient medium «supply» needed/maintained

b. optimal mixing

c. fermented in sterile bioreactor

d. alpha-galactosidase production/general conditions assayed/screened/monitored «throughout the process»

e. continuous removal of alpha-galactosidase/products

[Max 3 Marks]

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