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Date May 2019 Marks available 1 Reference code 19M.3.HL.TZ2.9
Level Higher level Paper Paper 3 Time zone Time zone 2
Command term State Question number 9 Adapted from N/A

Question

Citric acid is produced on an industrial scale and global production is over 1.4 million tons
per year with a rising trend in demand.

State one industrial use of citric acid.

[1]
a.i.

State the scientific name (binomial) of the microorganism usually used in this process.

[1]
a.ii.

Markscheme

flavour enhancer/«food» preservative ✔

a.i.

Aspergillus niger

Both names in full required.


a.ii.

Examiners report

Candidates did generally well in all parts of this question.

a.i.

Candidates did generally well in all parts of this question.

a.ii.

Syllabus sections

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.1 Microbiology: organisms in industry
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Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics)
Option B: Biotechnology and bioinformatics

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