| 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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